Hi @mlklovestory716, I just got back from our Honeymoon at the HRRM last week, and we loved it there. I'd say it isn't for everyone - it's definitely more of a "party" resort, so if that's your thing then it's perfect, but if you just want it to be quiet and relaxing during the day, it might not be your cup of tea. But since you had your wedding booked at another Hard Rock, I'm sure that atmosphere is already what you're going for! Definitely stay on the Adults Only "Heaven" side - it's a whole resort in and of itself, with it's own restaurants and everything, but you can easily take a golf card to the family "Hacienda" side.
As for the wedding itself, we watched one take place on the beach. It was really pretty and nice, except I felt like it would have been really loud, since it was right by the adult pool, and it was early enough in the day that there was still a lot going on. On the other hand, the beach is situated lower than the pool, so maybe the noise doesn't travel as far. You also deal with gawkers at your wedding (such as myself, oops) but I think that's the case anywhere with any beach wedding.
Another thing to keep in mind is that it has sort of a "man-made" beach. Like you can see in the picture, there's a break wall and then kind of a natural pool (where there are actually a lot of fish!) This could be a good, bad, or neutral thing depending on your preferences, as long as you go in knowing it's not your typical Riviera Maya beach. For us it was a good thing - we had dealt with so much seaweed at our wedding resort that it was nice to have a pristine sand beach!
Hope this helps!