why does java suck?

I've noticed in the short time I've been reading this board that there's a lot of java bashing, so I was wondering why people actually think it is so bad. I'm no java fan, but I've used it for some stuff before and it didn't seem terrible to me. An argument used to be that it runs slow as a guro-fied loli, but they've improved a lot in that aspect.

Please give good reasons, rather than stuff like "it's for certified professional consultants" or whatever you guys say.

Which reminds me, why doesn't somebody do a compiler for all of these languages like python to compile to java bytecode. I won't have the faintest idea how to do it, but it would be totally awesome. I know that JGNAT does that for ada, but that's about the only thing I know that does.