Hey! Stop using Blue Beetle as the example of a really weak hero. That's what Booster Gold is for!
One way to keep a balance between characters with different point totals would be to build the weaker characters with more special powers. The Wasp doesn't pack Thor's punch, but she can blind people with precise shots to the eyes, or flash their hearing with shots to the ears. Hawkeye has a wide range of trick arrows that can even the playing field. (and if the player is still frustrated, give him 200 more points and turn Hawkeye into Goliath II)