Here's the thing...there are a lot of regulars on this site who just love to talk about SxS's and share their experiences. However a lot of folks only post if they're having problems, or actually find this site looking for help with something, so you'll see more issues than you would in the general population...
^ What he said. That's the nature of forums - people post more with questions/gripes than they do just to say that they've had their
(whatever) for x years without a problem, or went on yet another ride with no problems.
I went through the same thing when I was looking at buying a KTM dirt bike. They used to have the reputation of being temperamental and requiring a lot of maintenance to keep them running. I got on the KTM forum and read all kinds of horror stories about various issues with them, but also gleaned from the long-time owners there that they were solid, reliable bikes. I bought one, and 8 years later I still have it - have never had one - not ONE - mechanical issue with it.
I'm new to RZRs, but not new to internet forums or off-road toys - I've owned plenty of them. As RZRCRZY said, you have to take the stories with a grain of salt sometimes. There are people who abuse the crap out of their machines, don't do required maintenance, then complain when it lets them down. Worse yet, you don't always get the whole story, so it can be hard to tell if the issue is legitimate or not....you get a guy complaining that he's broken 3 axles "just riding around" - but he doesn't disclose that he has a homemade 4" lift and his idea of "just riding around" includes 40' jumps and pounding miles of knee-deep whoops at top speed!
If you go read the Rhino/Teryx/Can-Am, etc. forums, you'll find owners of those machines complaining about problems/issues too. No machine is 100% problem-free and there will always be a few very vocal people who have had issues (either because a bad machine slipped through the cracks, or because they've abused it) and are going to let
everybody know about it, every chance they get.