My first thought was to write exactly what's been said. We went there on honeymoon in 2010 and liked it, but don't think I'll go back.
It's a nice enough place, but Cancun (well, Playa Del Carmen) seems so much more evolved and had a better infrastructure for going out the resort. Plus the standard of entertainment available, food and nightlife was better.
I'm not the type to sit and sunbathe so I got pretty bored in Dominican and ended up getting pissed in the pool most days.
As said the main 'interesting' thing to do (we were in Punta Cana side) was a helicopter ride, but I spend a lot of time sleeping in S-92's so that was of no interest to me