Squirrel: You can get it to look like the old one. Go to Taskbar properties, set it to small icons, enable text. You can also unpin the default entries.
I like the Start Menu changes (more focus on cataloging recent file activity per-program, this functionality is in the jump lists on the taskbar too). I don't like using text instead of icons for the shut down stuff.
[Edit: Oh yeah my screenshot program doesn't work properly under 7. Minute differences in the .NET framework per platform, BLEH.]
[Edit: And file and folder sharing is dependent on a LOT of the new services thanks to HomeGroup, disabling any of those breaks it. So you have to leave a lot of them running, which means less free resources for other tasks, and a more difficult task for users who want to slim down their OS.]