I'll weigh in on this one....I like the idea of a sticky along the line of what Christi and Josh took the time and thought to propose...
Actually, Christi weighed in against the idea, as did I. Attempting to rank and rate dive ops inevitably produces rancor and argument (reference this thread); keeping such a contentious thread as a sticky is, IMO, a bad idea.
As Marg and other have pointed out, reviewing of dive ops in here is largely cheerleading, not that there is anything wrong with that; folks naturally form a relationship with the folks they dive with. They want to show their favorite op(s) in a good light and encourage others to hire them. Turning every post into a plug for a dive op wears a little thin at times, but I am firmly in favor of freedom of expression as long as it does not become abusive.
The good news is that most if not all the dive ops on Cozumel are very good; there is not much value in a ranking and rating of dive ops because it is very hard to go wrong. Virtually every dive op on the island will be the perfect choice for someone.