Wet republic (the daytime pool club) is nice, especially if you can get a Cabana. When my friends and I went a few years back, we were lucky to be put in a cabana for free with grey goose & snacks (although there were other people using this cabana too, and idk if we just took their drinks and food lol). I really liked the mini pool that is by the cabana area and its super nice to have a large flat screen tv & bed to lie in when you get tired of the sun.
The room at MGM is alright. They've been renovated the past few years, & the beds are comfy but the MGM itself is pretty old... and not the most poppin' hotel. It's also far from the larger hotels & casinos so you're gonna have to taxi to those places unless you get heat stroke from walking in the Summer. I would recommend getting a hotel in a more central part of the strip.
Also, there are no good clubs nearby or inside MGM. Stay somewhere more central!