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.

Absolutely true.

But, isn't a 3D engine a realtime task?

I program in python, perl (limited knowledge), C (linux kernel and wine), C++, ada(95 and 2005), and lisp(limited knowledge). 

When I was teaching myself data structures, I did it in java. Why? Because there were lots of good java books for it, and it was much easier to learn with references rather than having to worry about memory management all over the place.

Oh and regarding that 'let me do my own memory management comment' I mentioned that because I'm of the opinion that garbage collectors will usually be slower than manual memory management done with loving care. Although, the more I think about it, that's probably too low level to allow for java to do, within its security boundaries.