Our daughter (7) brought this link home from school the other day -- she had played some of the games during her computer lab. The site is not horrible, but it's also not entirely appropriate nor valuable. The games are mostly cheap and poorly-conceived. And several of the ones she tried were just not appropriate for her age: adding clothes to very shapely "dolls" in their underwear; or giving a full salon treatment to the character, with nails, hair, etc.
Again, it's not that it was outright bad, but there was simply no value in it. Nothing educational, just consumerist fluff. There's so much good stuff out there, a site like this just isn't worth it.