I agree with you about the title bar, but you can change the font size to fix it.
The top panel,well, I also agree with you, but I don't see that as an area that needs to be crammed full of info, but some easy customization wouldn't go unmissed.
Regarding the package manager, it actually was redesigned not so many years ago when package kit came along. They've made a least one small change with it this time (greying out of version numbers) but I could use a redesign if, for no other reason, than it is actually pretty inefficient to use compared to synaptic.
I installed the alpha on my laptop yesterday with no problems. I'm not a fedora user but the main difference I noticed, compared to my brief go on fedora 15, is it ran much faster and smoother. I found fedora 15 sluggish with open source graphics and catalyst drivers still have the annoying graphical glitches with gnome shell.
I see gnome shell as having a lot of potential and look forward to watching it develop.