It can be demonstrated mathematically that the Flash is less powerful than other heroes. By less powerful I mean to say that he can trigger the use of his special ability less often than other heroes. If you compare him to the other "draw" hero, Cyborg, it makes the clearest comparison. Both of these heroes have the special ability to draw an extra card. When they are able to trigger this special ability, they will get, at most, one extra card in their hand provided by that special ability.
But what triggers this ability for both heroes? For Cyborg, it is equipment cards. One of the most common cards in the deck. There are a LOT of equipment cards and it is very easy to get them, allowing him to trigger this power quite often. On top of that, Cyborg has an additional ability tied to superpower cards, increasing his power for the turn. The Flash has no such ability. On the contrary, the Flash can only draw one extra card a turn at most. And this only triggers when he uses a card that specifically instructs him to draw a card. If you break your deck down, you will find that these are the FEWEST in the the deck. So if you only consider raw number, Flash will get fewer chances to trigger his ability. On top of that, draw card are largely considered very powerful and are sought after by savvy players. This makes it even harder for Flash to get the cards he needs to trigger his special ability.
If you consistently do well with the Flash, that could mean only one of two things; you are either a very talented player and would therefore do even better with another character. Or you need to find more competitive players to play against.
But what triggers this ability for both heroes? For Cyborg, it is equipment cards. One of the most common cards in the deck. There are a LOT of equipment cards and it is very easy to get them, allowing him to trigger this power quite often. On top of that, Cyborg has an additional ability tied to superpower cards, increasing his power for the turn. The Flash has no such ability. On the contrary, the Flash can only draw one extra card a turn at most. And this only triggers when he uses a card that specifically instructs him to draw a card. If you break your deck down, you will find that these are the FEWEST in the the deck. So if you only consider raw number, Flash will get fewer chances to trigger his ability. On top of that, draw card are largely considered very powerful and are sought after by savvy players. This makes it even harder for Flash to get the cards he needs to trigger his special ability.
If you consistently do well with the Flash, that could mean only one of two things; you are either a very talented player and would therefore do even better with another character. Or you need to find more competitive players to play against.