Isn't there a saying don't kick a man when he is down... in any case Mesa is much better than AMD's catalyst especially on my laptop's radeon 4200.
Case in point I can play wine games without artifacts which isn't possible with the proprietary driver. Performance is good enough for many classes of games. FPS games being the main exception. For the most part games don't require high frame rates. If it looked like warmed over pond scum at high frame rates what would be the point.