Well, I don't know about Lion. They removed some features I didn't use anyway and improved some of the apps I often use like Safari, Mail, iCal and so on. Mission Control does the same thing as Expose did, for me. The new scrollbars are okay for me, never used them anyway. The new scrolling is very good and far more natural than the old one. Fullscreen works but I don't see the benefit, so I don't use it. Never used resume so far, because I usually don't close any programs that I often use. I can imagine it to be very annoying though, because I want closed programs to be really closed.
Launchpad is the thing that pisses me off the most. There is just so much wrong with it. First, I don't even know why this feature is on a mac. We have a dock and we have an app folder. All of this works great on the mac, I never had any problems with it or just the slight feeling that it could be easier or faster. But the thing is, even if I would like to use it for some reason, it sucks. I never encountered software by Apple that is lacking so much thought. Did they even test it? I don't think so. It's like they ported it directly from the iPad and didn't adjust it to a mac at all. For example, creating folders. I actually like it the iOS way, just dragging an app over the other. But if you are dragging an app over an app that is the first of a row that app automatically moves to the last place of the row before that. Then you have to go all the way over to that app and if you are unlucky that app moves back to its original place. It's so annoying. It is not possible to drag more than just one app at a time. So assume you have two pages each half full. To make it simple you want all the apps of the second page on the first page. Yeah, you have to drag every single app over. Or deleting Apps. I mean, I have just two Apps that I can delete this way, but it takes so long. First I have to click and hold an App for a while and then I can click the "X"-Button. Why exactly do I have to do that? On a touch device I see it is a smart way to do it, but on my mac I have a lot of keys to press and a lot of space on the screen for a button or something. Or I could click on the App with two fingers, that's easy right? Well, apparently it is not iOS-like enough. So for me Launchpad is just a catastrophe in any way you can think of. It has just been added to make iOS users think "Oh, OS X is just like iOS, maybe I should buy a mac" but it fulfills no purpose whatsoever. That makes Lion an OS full of useless features that just exist to advertise and look good, not to make things easier. And I don't like it in Lion nor the tendency.
By the way, one of the multi touch gestures I used the most in SL was the three finger swipe to go back in the browser history. Is there any way to bring that back without having to install tweaks?