From what I've heard, the quality of Mitsubishis aren't the greatest anymore, but, really, virtually none of the major car manufacturers can boast outstanding quality outside of maybe Toyota and Honda these days. And even they have their problems.
I would lean more towards Subaru than Mitsubishi. But I'm no expert in either.
Edit: and to clarify, by "quality" I mean longevity and maintenance costs. Not the interior materials or look of the vehicle. Most GM cars and trucks look great, but they are rolling piles of junk when it comes to longevity and maintenance costs.