3. we played 3 games, and the Flash looks like underpower. His ability allow him to draw only 1 card each turn, and it looks like not a lot of cards in the game allowing player tp draw card. what's your opinion?
I think you are underselling Flash quite a bit. If you build his deck properly, ie. making sure you have a card that allows you to draw even a single card every turn, you are talking about an ability to play every turn with between 6 to 9 cards, which is a significant advantage if you can pull it off. This sounds harder than it is, because there are a bunch of cards that include the ability to draw a card as part of their text. Additionally, there are some location cards that allow for a card to be drawn and stay in play so that there is the possibility of triggering it every turn.
Long story short, give me Flash every game and I will be a happy guy.