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ToonTown is one of the best MMOs out there. It's not complicated. It's not deep. It's just fun.
FreeRealms is pretty good, too. If there were more to do in FreeRealms then it would be on top.
Lego Batman and Lego Indiana Jones are incredibly fun. I hear Lego Star Wars is pretty good, too.
Lego Universe is going to have the best crafting any MMO has ever seen (you actually build objects from parts), incredible customization of characters and housing, fun instances with interesting puzzles to solve, PvP and more.
If Lego Universe has enough group activities to keep people busy interacting with one another then Lego Universe players will eventually combine together and form a Lego giant so big, so powerful that it will be capable of smashing WoW into pieces that can be used to build better games.
Just imagine how badass a lego battleground would be where players scramble to build a fortress complete with defenses from pieces that are available before setting out to capture the enemy's fort with custom built vehicles and weaponry. It would be closer to Warcraft game play than any WoW battleground ever came.
Lego Universe is going to be fun.