I was in the Beta event for Lego Universe, and despite its rather childish UI (which makes sense as its geared for kids), My main problem with the game was the severe lack of content. The storyline of the game is there, its good, but at least come launch time there wasn't much too it.
Some stuff that wasn't covered in the overview was you can tame pets, who don't help you fight in combat, but allow you to dig up treasure. As well as the awesome dragon fight on the ninja world. This is one area where you need someones help cause you are very likely to die and by the time you get back the the dragon you'll have to start over from 100% health otherwise.
Also not covered were the 4 different factions, who offer 2 classes each. In my time in beta I played a Samurai, and an Engineer and had a lot more fun on the Engineer.
Its a fun game, but being P2P... It needs more content before I'll ever consider paying for it.