Casting an eye back to the early 1990s the creation of Bart Allen wasn't anything all that revolutionary or remarkable, after all dynamic young new heroes were in plentiful supply from DC and Marvel Comics, and yet Bart Allen did succeed in carving hiss own small legend, having a degree of popularity that lasted well after many of his contemporaries had fallen away into limbo or worse.
What is noticable, and sad to say, is that the character traits that made him so appealing before 2011's restart are today absent in the Flash family. That impetuousness and fun loving kid ceased to be with the rebooting, though this speaks more of the lack of any humour and irony on the past of Dan Didio and friends than it does on actual audience tastes...
Todays new Kid Flash is a fun-free character. And yet is there irony to be had in the sight of Marvel Comics' Quicksilver, in particular the movie version, having quietly adopted many of young Barts traits? How ironic that another companys character has taken on the abandoned character traits of the original Impulsive speedster... that a lack of understanding of what the audience is actually looking for has hamstrung the potential of the new Kid Flash, and indeed The Flash family in general?
Don't read the Flash books outside of Titans and New Teen Titans, so my comments relate to the CW:
I think TV Barry is a mesh of comic book Barry and Wally: Grant's Barry is nowhere near as serious as my opinion of Barry Allen, yet also has Wally's reluctance. While in the books Wally's angst was related to being better than Barry. TV Bally angst is just as real, but more to do with being a 'good' hero. So the angst is there, but just not for the same reasons. I have never come across a Barry Flash that had angst about his powers or being good enough.
TV Wally is a combination of Wally and Bart ( comic book Wally was so amazing, they had to break him into two!!!). TV Wally has the great desire to serve that comic book Wally, but he is just as reckless as Bart. Going up against and losing...BADLY against Savitar was.....awesome?!!? Reaching for the Philospoher's Stone in the first place in order to get 'perceived' powers back, was reckless too. TV Barly just isn't fun like comic book Bart. If they would inject the child with a sense of humor....that would better serve the character fusion.