Sure I'll elaborate. By the way, if you have any way to fix these problems via configuration, please let me know.
Minor complaint: the default theme is a fixed-pixel gradient that doesn't rotate when you move the bar to the right, so the vertical bar looks like closed venetian blinds. I can change the theme, but the default should be better.
Bigger complaints:
The status icons and notification area don't rotate and/or crop themselves so you can't access most of the important icons.
The application buttons DO rotate the text 90 degrees, but (my preference at least) they should be the only thing that doesn't rotate. The problem with horizontal application buttons is you quickly run out of space; I move the task bar vertical to eliminate that problem -- this is a problem with Gnome's implementation, not Ubuntu.
I'd be happy to remove the top bar, but a lot of functionality (wireless configuration menus) is difficult or impossible to access without it.
I normally have the terminal, browser, and emacs set to hotkeys as F1, F2, and F3, so I don't need an application menu other than to start apps I use infrequently. A context menu would be sufficient.
Perfect world:
What I'd really like is a blank screen with some method of seeing running applications that remains hidden most of the time, and a way to easily start applications, see wireless config, and log out.
The last desktop I had that worked exactly the way I wanted it was FVWM, where everything was accessed via hotkeys and root window context menus.
Unfortunately a lot of the niceness of Gnome, like the wireless config stuff, battery notifications, auto-mounting of USB Drives, and status icons you'd typically expect are dependent on using the Gnome/Nautilus interface. (At least I think that's the case.)
I'd probably be happy with FVWM again if using it didn't mean abandoning all the configuration apps and automation that Gnome provides. Right now, I'd have to log in to FVWM, and start a bunch of scripts to configure wireless, start the 50,000 daemons that make Gnome run like a modern UI, etc.
It's a lot of work to go through to reclaim 42 pixels from the top of my screen.