I'm not sure if I'm just lucky, good with preventative maintenance, etc. - but with 30,000 miles on my Tribute I'm happy to report I haven't had one thing go wrong! I still love my truck after 2 years.
Pros: got a great deal, 100% reliable so far, lots of torque in the v6, moonroof is cool, leather seats are comfy, power seating nifty, fog lights, AWD, seating position, A/C works great.
Cons: tires are noisy - thinking of replacing them early, gas tank far too small (20 gals would be way better than 16.5 gals Mazda!), heated seat switches are in bizarre location, wish the CD player handled mp3 disks, seems like it should warm up slightly quicker - but it is a big engine.