I think that's the whole point, though. It becomes clear very very early on in the show that he no longer needs to do what he is doing, if he even ever really did, even ignoring the financial aspects given the risk it takes. It becomes about his ego early on, especially given his belief he was screwed out of fame and fortune earlier in his life, so when he is trying to seem altruistic or trying to seem badass it is always through the lens of someone doing it for their self-gratification.
I don't exactly know what Kepler is expecting it to turn into, since he admittedly has not seen it and thus has no idea what he is talking about, other than his knowledge that if a lot of people liked it then it is passe and he is personally above it. I guess he thinks it tries to portray Walter as some Dirty Harry/Death Wish -esque normal-guy-turned-anti-hero, which is certainly does not, and frankly the fact it specifically does not do that is what made it so good.