You know, I like the free on-line rip-off of Scrabble, Lexulous, which used to be called "Scrabulous" until until litigation forced relabeling and a site change.
Anyway, it's fun, but I have one major complaint: Their bot difficult level is all screwed up. I initially started playing the Intermediate bots, and roundly got my ass kicked. So then I backed up to playing Easy bots. Against them, my record is about 50%, and it's not uncommon to see them score 350-400+ points in a game. This is not an easy bot. I'm no Scrabble slouch, so if I'm getting my ass kicked half the time by their Easy bots, then something is horribly wrong.
I guess one answer would be to play against people. But bots are way more convenient in general, and they take a lot less time to play. Meh...it's still a pretty fun game.