I know Reasonable I was just highlighting for those posters who don't look at which games use what engines that there are AAA big sellers out there that use them very well. Don't forget Bioshock is modelled mainly on UE2.5 not 3 so it's not directly comparable to Gears. Also Bioshock had to sacrfice some nicer character models for the variation in environment and enemies. Gears did a very good job of hiding the number of textures it reused, people knew it was happening technically but onscreen it didn't show.
On the flip side of the coin you could argue that some developers concentrate too much on selling a engine at the expense of their games, ID for me are a perfect example of a leading engine developer that have missed the mark when it came to producing some games based on the technology. I think in the vast majority of cases you're correct though that the best games do tend to be built with custom engines from the ground up.







