Yeah, I agree with the other people in saying that the graphics are wayy too cartoony. And to be frank, the graphics aren't that good. Most of the buildings and units look similarly supersized. Technically, the graphics look dated like something from 2003. In fact, I think it looks worse than Warcraft III! Modern day RTS like C&C 3, and Supreme Commander have superior graphics. C&C 3 has very nice and realistic lighting, shadow, etc. effects while SupCom handles scaling very well.

 My hope is that the StarCraft II images are screenshots of a pre-alpha build of the game. The very early game shots of Supreme Commander looked pretty cartoony as well. 

 Here's how an modern day RTS should look like:

The first 2 are from C&C 3, the second 2 are from SupCom. Here's what Starcraft looks in comparison (WAY too cartoony):

 It might be an early build, but I'm sure most people will agree after seeing the other screenshots of other RTS, that Starcraft II looks so far, not at all next-gen like.