I used to stay at the Excalibur a lot as a kid. It's a pretty nice place to stay if you're a family with kids. I have pictures as a 4 year-old with the knight statues in there. I absolutely loved the funzone downstairs. There's an arcade and tons of different Vegas-style games (like the horse racing game, which was my favorite) in there and it's just a blast. I also really liked the magic show in there when I was a kid. The buffet was pretty good for breakfast, from what I remember.
This place is a little older and I would not want to stay there now, in my mid-20's. Though they have a beer pong tournament in there and of course the standard casino and also the Thunder from Down Under show, it's still a very family-oriented and childish place.
I do have fond memories there though and I would highly recommend families to stay there if you are going to Vegas.