I also have found Lion to be a big stop below Snow Leopard in terms of usability. It has a lot of good ideas but is really, really low on polish. Things like iCal and Address Book look like absolute crap while also providing lower levels of usability. I find that Versions add more work and worry to my workflow as opposed to making my life easier, which is what is supposed to do.
Mission Control really killed Lion for me and I am actually looking forward to selling my Macbook Air next week because I just hate using it. Which is sad because the hardware is amazing.
Tim Cook just doesn't have the "NO" mind set that Steve Jobs had and it really shows. The engineers aren't being pushed to do better or think things through and get things polished to perfection.
I don't buy this excuse as Steve was still around when Lion was was released and was certainly around while it was being developed.
All I can say is that Leopard was the first OSX that was noticeably slower than its previous release (all others had been faster along with more powerful) and at least for me, Snow Leopard was slightly slower than Leopard on my late 2008 Macbook Pro (at least according to XBench). It wasn't noticeable, but I was expecting a tuned up/faster release like Tiger since they were marketing it as a cleanup version (the only thing they cleaned up on was taking PPC out to trash as far as I can tell). I've yet to upgrade my MBP to Lion since I've read so many bad reviews. I like Spaces as it is. I don't want Mission Control. Why can't Apple offer the new modes as OPTIONS and keep a preference setting for those of us that like the Snow Leopard interface for those features? Windows has offered classic compatibility and visual modes for ages and you can get 3rd party software to make it look any way you want (Linux is even more configurable). Whereas OSX is "take the new look or go somewhere else" every freaking time. It's very irritating.
I just assumed it was Steve Jobs forcing "his view" as the ONLY view. But he's gone now so it's time for Apple to stop the "crazy/paranoid" crap and put Apple back into the Professional standing it used to have for so many years until Steve's obsession for the iPhone turned it into the unwanted 3rd cousin.
Let's see NAS and standard networking support for AppleTV. Let's see the TimeCapsules offer their own storage for it. Let's see Final Cut Pro return to its full glory in features. Let's see an update to Logic Studio or at least Logic Pro. How about Blu-Ray support at least for professionals that need it for their job? How about supporting the freaking customer instead of the other way around? Apple has become complacent because their iOS products are selling through the roof. That brings a lot of secondary sales to the Mac that it probably doesn't deserve lately.
Even so, I actually want a new Mac Mini for once in my life to replace my aging PowerMac PPC whole house audio/video server, but only god knows how much longer I will have to wait for them to release one with USB3 on it (I won't buy one any sooner) and because it will come with either Lion or Mountain Lion, I'm not sure I'll be thrilled with it, even so. But it's a replacement server first and foremost, but then because that machine is on 24/7, I end up using the server for e-mail and web browsing most of the time.