Marvel to D&D 4th Edition

I'm hoping to get my old, once per year rpg friends to play some D&D 4th edition this summer, and we might try to convert the old Marvel characters into D&D, in order to keep the story going in some way.

As such, I've created a quick table of 4th edition classes by role to help their decision making:

Defender
fighter
warden
paladin
swordmage

Striker
rogue
warlock
barbarian
sorcerer
avenger
ranger

Leader
cleric
bard
shaman
artificer
warlord

Controller
wizard
invoker
druid