it depends if you have kids, and the ages, but I think Blizzard Beach is brilliant for younger kids - they Tykes Peak area is superb and far superior to the equivalent at Typhoon Lagoon. At BB there are 3 or 4 mini versions or proper slides, Katie loved that she could go up, get a tube and slide down, just like the big kids.
Then, once they get the hang of that, there is the Ski Patrol area which is a step up from Tykes Peak, she tried a few of those slides at the end of the day and really enjoyed them.
PLUS - the family raft ride is just superb - I haven't laughed so much in years, we thoroughly enjoyed it.
I have to agree I was a bit worried about the theme, all that white concrete didn't appeal, but we had such a superb day that it just wasn't an issue.
We went to TL the following week, and were really disappointed, the kids area is poor, and mainly consists of things to spray water at other kids, which my dd hated, and the sand which seemed like a nice idea, just seemed to get everywhere. And, then we tried the family raft ride, and it is very short and nowhere near as good as BB, so we are completely sold on BB from now on.
Bev