Again people will kick my balls for this but:
Overused as HELL. They are great models but is so boring to watch every player with those items.
Be creative, there is a ton of other hats and misc to pick.
Really dislike promo items that aren't Community-Made. Most of them are just shoe-horned into TF2 to just draw in money and they don't even look good; like the Bolt Action Blitzer, Robot Chicken Hat, and the Jagged Alliance and Kingdoms of Amalur promos. Of course, though, there are some small exceptions.
my least favorite is probably the earbuds
Troublemaker, Team Captain, Halloween Skull and The Anger, why do I fucking see it everywhere? Also earbills combo.
Fast Learner when it doesn't make sense with the hat it goes with.
Last Breath when it's equipped just because it's their only head replacement
Painted Gibuses and hair items painted something that isn't a natural hair color.
There's a lot of hats that I don't particularly care for, but these hats in particular I actually loathe.
Scout: Bonk Helm
Soldier: Dapper Topper, Drill Hat, Exquisite Rack, Battle Bob, Hat without a Home
Pyro: Madame Dixie, Dead Cone, Pyro's Beanie
Demoman: Hustler's Hallmark, Afro, Glengarry Bonnet, Snapped Pupil, Shutter Shades
Heavy: Football Helmet, Hard Counter, Coupe, Magnificent Mongolian, Gym Rat, Dread Knot, Pugilist, both Luchadors
Engineer: Buckaroo, Festivizer, Headpiece, Ol' Geezer
Medic: Geisha Boy, Doctor's Sack, Planeswalker's Helm,
Sniper: Larrikin Robin, William Tell Apple
Spy: Ketche, Beret, Camera Beard, the Noh Mercy when it's combined with any hats (alone it looks rad), Magistrate's Mullet
Multi-class: All Father, Private Eye, Gibus, Max Head (there's a story I have about how I stupidly traded mine for a v. sola topi when trading came out, but regardless I think it looks atrocious), Towering Pillar of Hats, the treasure hats and HOUWAR, Festive Tree, Kenmuri and Monarch, Lo-fi Longwave, Holiday Headcase, the Point n Shoot, earbuds
I know there's some odd ones in there, so I guess I'll explain them how I can:
Hallmark: There's a lot of people who seem to love this hat. I dislike it really just because I think it looks kinda trashy. I know that's the intention, but I just can't bring myself to like it. I've tried, seriously. The fact that 50% of the Demoman population seems to wear it doesn't make it any better, mostly just seeing it all the time gets annoying and boring.
Ol' Geezer: This actually fits TF2's artstyle quite well, and it looks like a hat that would fit perfectly onto TF2's concept art at the time of it's development. I just hate the shape, honestly. Can't say much else.
Larrikin Robin: Same as the Hallmark, really. Looks kind of trashy and gimmicky like the Pyro Beanie and the Buckaroo, even if it does fit the whole "Sniper is a marksman" idea.
All Father: Just looks terrible to me. I really hate seeing it on soldiers and heavies, it just looks way too goofy for my taste.
Camera Beard: See Larrikin Robin.
And that's really it.
I hate the charmer's chapeau. It's just so..unfitting. Fedora is so much nicer of a hat. No idea why the chapeau is god tier.
Everyone who hates Dr's Dapper Topper have no soul
1. Essentially every pyro hat.
I wear only all-class items on my pyro.
2. That fucking ugly as shit Awesomenauts sniper hat. EUGH, I despise it.
3. Any sort of good hats that are painted terrible colours.
4. Any sort of hat painted lime / pink.
5. Purple. Fucking. Hallmarks.
Everywhere I turn, my favourite hat in that gaudy-ass colour. "LOL BCUZ PIMP XDD" Shut the fuck up.
So much rage.
I hate the Team Captain. It is overused to hell.
I don't even have a hat per class. I use the Team Captain (Bought it when it was on sale) because it's the only shit I have.
My list will be comprised only of items I find aesthetically repugnant, not spammed to death good items like the Fast Learner.
Starting with things off the top of my head that are of particular distaste, moving on to things I remembered disliking while looking through a list of all hats:
The Frankenstein Heavy items (all)
That giant present thing
Bolt-Action Blitzer (that's the football helmet with the bolts, right?)
El Jefe (simply because it shouldn't be a scout item, I rather like it)
Helmet Without a Home
Mask of the Shaman
Liquor Locker (just bulky/out of place)
Capo's Capper (tacky Fancy Fedora)
Engie Halloween items.
Gatsby (my first craft :-(, class specific 4 ref down the drain)
Cosa Nostra Cap (like a Fancy made of modeling clay, ick)
Noh Mercy (purely because of clipping)
Col Roule (just a bit bland, I saw a retexture in the workshop with stripes, it was good)
Company Man & the rest of the caps
I don't understand how being overused equal hatred. It's like second nature.
If there's 1 thing I dislike more then the broken hazmat (which I hope gets fixed)
Is the team captain.
Know what I'm even more sick of then that?
Seeing UNUSUAL team captains.
I like most of soldiers hats, favorites being AA, stash.
I hate all the football helmets.
Anyway, stuff I don't like? Not much really. Max Head, anything painted lime or pink (other than the Professor's Pineapple, it looks really good with lime), skull-veil, Private Eye (when used on Medic, because of how badly it fits) and the Christmas tree hat.
Oops, forgot about miscs.
Ornament Armament, Jingle Belt and Liquor Locker are all really bad IMO.
I hate the fucking fast learner because every scout I see has it, and it always has some gross unfitting color like pink or lime green.
I also hate people with high tier promos (Bills, Max, Deus Specs) that don't even appreciate the game it's based off of, rather only using it as a mark of status amongst the trading community.
I don't necessarily hate the deus specs, I just think they're overrated.
A lot of people out there think they look good with everything, when I think they only look good with a few things.
All-Father, Deus Specs and Buds are prolly my most disliked miscs.
I also don't like any hat that shows the Soldier's eyes. Except Battle Bob.
Also I can't stand most of the pyro hats because they make him look like a retarded 4 year old
I don't see why everyone orgasmed over those new Sleeping Dogs items
I hate the Team Captain, it's so overrated.