I have'nt had too many problems with either Fallout 3 or Oblivion. And once I installed the patches hardly no problems at all. (rare crash once in awhile) And while there are a few design issues and things I would like to see done better, I really can't complain and have had hours and hours of enjoyable gameplay.
One of the biggest selling points for me are the big open worlds they have. In fact, after becoming an avid 3000ad fan years and years ago, I'm kinda spoiled now. I just can't get into games that involve hand holding and where you are forced to go a certain path with limited options. So these are the kinda games I really look forward to. (besides being an avid simmer, online racing, flight sims, space sims, ect.)
Guess I'm a loyal Bethesda fan.