I installed 12.04 about 6 to 8 weeks ago (I think, may have been less than that) and I don't really like it that much (I kind of like it and hate it). It looks good, but that's about it really, but the idea of it looking and working different to Windows has me interested.
I've had problems pretty much every time I've used it (about 5 or 6 times or so) that ultimately end up in me rebooting and letting the laptop boot into Windows. The update manager broke because Google Chrome failed to install. Spent hours (at least an hour or two) looking for the files to delete them. Deleted them, problem still continued. Deleted them several times, problem still there. Eventually fixed itself after messing around in Terminal. Update manager broke in a different way then which then fixed itself eventually. Latest problem, Cairo Dock failed to install from software center and on their site they want me to mess about in Terminal to install it, which failed. Why don't they (program devs) just provide a straightforward download link and let something like Install Shield do it. Mac, Android, iOS and Windows all work in this similar way (iOS and Droid being their respective stores). I can't find my installed programs (other than software center which is prone to breaking by itself), I can't locate where files are saved (in the case of Cairo Dock it part installed and then errored, now I can't find where the files are to remove them). The over-reliance on Terminal is really something I don't like, why can't I use Ubuntu entirely from the GUI (I probably can, but I'm no longer bothered to find out)? Why can't I change my mouse theme either? Last I read about it it involves entering code into Terminal. Why? Just put it as an option in settings
Whole Ubuntu experience has just left a bad taste in the mouth really. Will probably just end up uninstalling it and maybe come back with 14 when it releases, but at this point, believe it or not Windows kind of just works (until I get my hands on Mac OS, if I ever do, then I will probably think the same about Windows). Ubuntu was just a series of problems and over-complicated things and only really used for web browsing in the end. I'd like to use it, just the way it functions and I do not agree.