What's the last version you used? They put a substantial amount of work into stability and bugfixes in 14.x, in fact there was one quarterly release within 14 that was nothing but bugfixes. It's annoying that they were necessary, of course, but you can't legitimately suggest that they're not making any effort to improve the software. Many of the bugs that people consistently complain about not getting fixed (eg, gerber generation) I've never once seen, so your mileage may vary.
Anyway, AD would hardly be the first high dollar design software to be occasionally buggy and unstable (have you ever used AutoCAD, especially in the 2012-2014 range?, and even with its faults, on the whole it's still a vast improvement in productivity over Eagle or KiCAD, although it has a longer learning curve. I haven't used any of the other big EDA packages, so I don't know how it compares in productivity or reliability there, but as far as I know it's substantially less expensive than the other big players, so you'd have to balance any increased productivity against the increased cost.