I will start this out by saying the good - the rooms are clean, and it has a beautiful view.
However, I would not recommend this hotel to anyone who is not fluent in Spanish. Most places I have gone in Mexico (all-inclusive, at least), at least work with you and try to understand when you speak broken Spanish or even English. However, that is not the case here. Even when you try to speak Spanish to the best of your ability the staff makes you feel judged and even gets quite rude with you. Never mind speaking English. This resort caters to Spanish speakers specifically. While we were there, we met maybe 3 other non-Spanish speaking couples.
There is also nothing to do at the resort besides the pool. There are no bars, just the one main restaurant (where the food is not good, by the way), and the pool. Oh, and speaking of the pool, they allow people to save chairs starting as early as 6am. By the time the pool opens at 9 there is not a single chair available. The one time we got there early and saved chairs, by the time we came down, security had removed our belongings from them. We never saw them do this to anyone else, so that was frustrating.
The pool is extremely loud with staff playing games with children over the speakers. Definitely not a good place to relax, but also not a good place to party.
I truly recommend thinking twice about booking this resort. Skip Mazatlan as a whole and go somewhere else in Mexico, honestly.