This reminds me of the recent Postgres vs. MySQL discussion in that the Postgres users/developers were so convinced of their superiority they didn't bother with all the little things like easy installs on windows and so lost to an inferior (in certain ways) foe.

I like Opera as a company but their desktop UI has always had a clunky, KDE-like feel to it. It's configurable enough that you can change it quite radically but they start with lots of stuff turned on.