What features are you most attached to in your database of choice? What do you hate?

I'm interested in what people like most and least about the databases they use. For instance, I mostly use Oracle at work, and about the only thing I like about it is that it's easily supported by other software packages that need a database of some sort. Aside from that, it's resource hungry and has a lousy command line client. In projects where I have my choice, I use PostgreSQL. I know my way around PostgreSQL better than I know any other database, and I can get stuff done when I'm using PostgreSQL. I can (often) easily see why slow queries are slow and what to do about it, and it supports complex SQL. I don't like upgrading it, and although I don't mind that a default PostgreSQL installation doesn't come with a kitchen sink full of add-ons and modules that I'll never use, when I need a module it's occasionally tough to find what I need and to make it work with the installation I've just done.

What do you like about your DBMSs? What do you dislike?