Those are some really nice models for an RTS game. Most RTS games are pretty low poly and the textures are low resolution. But damn...that's impressive stuff.
There are 3 levels of detail:
- The ultra high quality marine that you saw in the very first trailer for SC2 with the marine getting suited up. That stuff takes a long time to make and animate, so they do it rarely.
- Medium quality model used for in-game cinematics. Around the level of your average character in a current gen game.
- Low detail model used for gameplay.
The model here is the middle one, not the actual little marines you control in the game.