I used to stay at TI. The last few visits we have moved around. Mirage has been my favorite so far. Nice rooms, good restaurant selection, good gaming, ok price. excellent location. Our room looked out over the volcano show, which was cool. Actually were in the room once during the show.
If you want to live it up in Vegas without Bellagio costs, try the Mirage.
Disappointment: the brass mermaids that Rusty stares at in Vegas Vacation have been removed. My nephew once violated one of these and I could not get the camera to work. Shame to miss out on that, especially now that they are gone.