I really enjoyed the first 10 or so hours, but it's just a bit too repetitive.
I've still got 4 more bosses to beat, so I can't speak for the entire game, but the repetitiveness of Tartarus is starting to get on my nerves. It's partitioned in "blocks" that don't really look different from one another.
I was hooked on the game initially, but now that I'm on about the 110th floor I'm thinking "Enough, already." If there were some FMV and better social interaction I think the game would be much better, but I think I'm going to be putting it down for a while.