your comparisons seem a bit off to me. RE5 not being like the others is not a matter of "catching up". System Shock 2 was just as scary as Bioshock and that was 10 years ago too. you also picked only a few examples, and not really the best - AC and Batman are miles away from either Splinter Cell or MGS as "stealth" games.
I don't think they need to make great games in every genre...
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