That's just it, I think. DD and Spidey have always had a fair amount in common, and the way Stan Lee originally wrote the character was in his usual lively, wisecracking vein, which Mark Waid has returned to in the current run. Personally I think that kind of devil-may-care attitude makes more sense for a guy called "Daredevil, The Man Without Fear" than endless angst and despair. Besides, since the MCU doesn't have Spider-Man, maybe they could use a Waid-style Daredevil as the closest equivalent -- sort of the way Smallville and Arrow have used Oliver Queen as a surrogate Bruce Wayne. Although of course there are a lot of things that make Daredevil distinct from Spidey -- his blindness, his greater career success, the fact that his identity has been outed or at least suspected by the public more than once, his ninja training, etc. Then there's the fact that part of the strength of Waid's more relaxed, light-hearted characterization of DD is that he does have that long history of angst and despair, so that his new attitude is a deliberate reaction to that, a decision to adapt and make a new start, whereas his best friend and partner Foggy Nelson believes it's just denial and possible mental instability. So it's his history that makes him different. Um, no -- Matt isn't a scientific genius at all, and he doesn't use that much tech beyond his fancy billy club/cane/grappling hook thing. I don't really see the Tony Stark comparison, unless it's to the angsty, broken, "Demon With a Bottle" Tony Stark rather than the RDJ Tony Stark.