I'll echo the ones about progressive owners who art not courteous by leaving without notice or taking way too much time to draft or enter their team. That said, I've grown more patient with it as I know how it is to have stuff come up and not be online for a period of time.
And one that happens in all walks of life, but I've seen here in discussions on the boards: People who back up their opinionated arguments with more opinions. That'll win me over! Never mind facts, they don't matter!
As far as the sim itself, I'm getting a little weary of the bias towards hitting in all but the most pitcher-friendly eras of progressives. League ERAs should not be anywhere near 6 unless there is some sort of weird theme going on.