Overall, my family had a fine time at the Montbleu. While it is in need of some upgrades and repairs, we were very pleased with our experience.
PROS: Location -- easy to casino-hop, and right down the road from gondolas, shopping, etc.; pool area is fantastic; comfy beds; reasonably well-kept rooms; I like the design of the hotel, with the three hallways to the rooms branching off from the center hubs; slots that aren't too stingy with the payouts; breakfast at Café Del Soul was relatively inexpensive but tasty.
CONS: Outdated television; while it's a neat idea to have a jetted tub in the room with you, it's not as good in practice as it's very noisy and messy; hotel needs some renovations and repairs (carpets, etc.); bottles of water in the room, but $3.00 if you open one??? (and ours had a bottle that was already opened... don't know if we're going to get charged for that); no fridge or coffee makers included; overall, our stay was a little pricey but it WAS Memorial Day Weekend.
But, the Pros definitely outweigh the Cons. We'll probably be staying again, soon.