Same thing here. I posted a while back about how turned off I was with the choppy GUI animations using the Intel graphics in SL; the same thing persists with Lion. It is completely beyond me how Apple cannot get their hardware and software on the same level. Clearly their OS must be graphically just as fluid on their lowest level hardware as it is with anything else.i have a 2010 mbp 15" HR AG with the i5 and nvidia. full screen apps are horrible for me and animations stutter all over the place. especially on the intel IGP but also on the nvidia 330. mission control isn't smooth either.
thought mine was a pretty recent mbp, but either they want me to upgrade already or they have serious graphics issues in lion.
OS X Lion is the worst OS X version ever concerning GUI smoothness. Leopard and SL did a very good job at release.Leopard was the same at .0 as was snow leopard. It will improve with updates.
The graphics drivers and frameworks are probably just "good enough" for lions release. After they remove major bugs with the .1 update, then they should focus on graphics performance.
All speculation and guesswork by me though.