I bought my 2013 WR250R brand new in March, 2013. I've put 10,000 miles on it since then. I didn't get a notice for the stator recall, and mine died on the trail, resulting in a lot of pushing and a ruined riding day. The dealer took care of it as expected. Other than that, it has been fantastic.
I have been through something like 6 chain sliders in those 10,000 miles, but I think I can blame that on the inexpensive RK O-ring chain. The links appeared crooked since day 1 with that chain, and I think that is what was eating into the bottom of the slider so much. I switched to a DID X-ring chain about 1,000 miles ago, the links are nice and straight, and the slider has almost no wear on it. I'm very good about chain maintenance and adjustment, so the conditions have been the same for each.
Most of my tweaking on the bike has had to do with different tire types and gearing. Oh, and I broke the subframe by putting too much weight on it. I used to have a Rotopax 1 gallon jug on the back along with a Peak tailbag with my tools and lunch in it. I ride off-road in a pretty aggressive manner, so all that combined weight leveraging on the cargo rack for all those years finally caught up with me. A buddy of mine welded it up, and I have given the Rotopax away to a friend. I still use the Peak tailbag, but my backpack has gotten heavier with tools and water.
Lee