I always hear that Stealth games are bad if they don't let you do blah blah blah. It usually amounts to, stealth is bad if you can't go guns blazing. I loved Splinter Cell 1, shadows, etc. I play every stealth game, even Styx or whatever. I know i work to make stealth action based for selling it and for obvious reasons, all media is told to be fast and action. But dang do i love learning patterns, sneaking, and more. I never really even use all of the gadgets to make the games more "fun".
I'll add that I grew up playing real-life games with friends where we acted like guards and i snuck in the "base" home. I never lost. :). Point is, I know Covert slow stealth. They all seem boring but can we stop making it seem like no one wants them. We cater so much to fast fast fast action, that we forget people enjoy time to plan out. Lol. Not sure if that hits mainstream sales though so I understand why stealth games are low.