I honestly think that the Bellagio is highly overrated. Our room wasn't any more impressive than at MGM or Mandalay Bay, minus the fountain view. There was a terrible smell at the pool which was, again, not particularly special otherwise. We were treated very poorly (suspiciously) at the roulette table, and got pretty horrible service and drinks for a ridiculously steep price at the bar by the gambling floor.
All the special things about this hotel (fountains, arboretum, Sensi restaurant which is fantastic) can be accessed as a non-guest. I'd rather stay somewhere else and spend an afternoon at Bellagio.