In all-inclusive travel, you truly get what you pay for.
I recommend focusing searches on properties with at least a 4.5 rating. Value properties often struggle to provide quality food options, comfortable accommodations, and adequate service.
Although entry-level rooms are the least expensive, booking them can also come at a price.
The cheapest rooms can have views of the parking lot or construction sites. Or they're located on the ground floor, which can get musty if you're in a humid, tropical location.
You can often upgrade to a better room for a minimal extra cost, and I think it's more than worth it. If you're really on a strict budget, shorten your trip by a day or two to allow for a higher-quality experience.