OP, keep your reservation! Where did you see these reviews? Regardless, a bad review will be posted more often than a good one. And once someone gets irritated, they will notice each and every thing that goes wrong, even slightly wrong. We all do that, I know I do! I love this resort, we haven't stayed there in a couple of years, but I just today moved my ASMU reservation over to POR for our April trip. I have seen some negative reviews on Tripadvisor for POR and every other resort at WDW. In all of my stays at WDW I have never had a dirty room or a room that I thought was very rundown. I have had some stays where I preferred a certain theming but in all we have been completely satisfied. I am not worried and looking forward to my trip and I hope you will too!
I also agree, if you check in and find your room not up to par, call and ask to have the problem taken care of even if it means they find you a new room. Disney customer service is among the best around, they want you to be happy.