I was just down in September and rented a place in PDC through Air B&B for my 10th or 11 trip to PDC. Bought my booze at MEGA and Walmart, no problems. will generally only drink beer at a bar anyway, drinks are too expensive and easy to mix my own.
Joking aside it does seem like it was and may still be a real issue at some all inclusives from what I have heard, but I went out to a few bars on 5th and never had a problem. I have seen people get obliterated due to vaca excess and strong drinks but have never personally had a problem or seen anything that looked like a drugged response. I could easily believe it happens however, since from what i have read, unregulated liquor could be bought cheaper by the bar managers so they had an incentive to do so to increase their profits or get kickbacks. What really scared me honestly was the responses people have reported getting from the all inclusives once the victims voiced concerns or complaints, even more reason to go self catered in dead seriousness. But I have honestly never felt unsafe in PDC itself, even late at night and off 5th near 307. Worst I've ever experienced it attempted price gouging for taxis, and incorrect math on one or 2 restaurant bills.
As far as tripadvisor I have heard numerous people complain that they censor severe negative postings aggressively. meaning you can complain about the lack of red wine at the bar, but you can't post you were assaulted by an employee. it is all word of mouth but this story seems to back it up, as do local message boards regarding similiar incidences at other places like Belize