I'm assuming you're staying at an all inclusive resort? If yes, that sounds like an appropriate price, if it's not all inclusive, that's A LOT!
We had our wedding at the Barcelo Palace (a 5 star beautiful resort), Riviera Maya June 2008- Our 7 nighters paid $1,300-1,400. 5 nights $1,100, 4 nights $450 etc... The price included resort, taxes, transportation to & from hotel/resort and airfare. The all inclusive food & alcohol (a lot of top shelf) was worth it. All guests booked their own air, but at the time it was $370-400 range for roundtrip (most guests flying from Pittsburgh).
Our guests thought the price was right, we had 60!