(Image taken from MarvelCDB)
Today, I'm going to look at where Aggression Spider-Man stands, and write out a deck for him.  Unfortunately, the Thor pack hasn't released yet, which would contain a bunch of new Aggression cards, but I'll work with what I have, and see how it goes.

Spider-Man seems like a natural fit for aggression.  He has a good ATK value of 2, and already comes with some pretty powerful attack cards in the form of Swinging Web Kick, and has the tools to keep himself alive and safe with Backflip and other cards.  He'll naturally be going in and damaging the villain, so why not add some cards to keep that damage dealing up?

Here's my deck, as it currently stands:
Spider-Man
Packs: From Core Set to Ms. Marvel

Upgrades
2x Spider-Tracer (Core Set)
2x Web-Shooter (Core Set)
2x Webbed Up (Core Set)
2x Combat Training (Core Set)
1x Endurance (Ms. Marvel)

Events
2x Backflip (Core Set)
2x Enhanced Spider-Sense (Core Set)
3x Swinging Web Kick (Core Set)
3x Chase Them Down (Core Set)
2x Relentless Assault (Core Set)
1x Uppercut (Core Set)
3x Melee (Ms. Marvel)

Supports
1x Aunt May (Core Set)
3x Tac Team (Core Set)
1x Avengers Mansion (Core Set)
1x Helicarrier (Core Set)

Resources
2x The Power of Aggression (Core Set)
1x Energy (Core Set)
1x Genius (Core Set)
1x Strength (Core Set)

Allies
1x Black Cat (Core Set)
1x Tigra (Core Set)
1x Mockingbird (Core Set)
1x Nick Fury (Core Set)

So far, I've run this in a few situations- Rhino and Risky Business, at least, and both times, it's worked great.  He keeps the damage up, and can afford to spend a turn in Alter-Ego form to heal or even build up.  Overall, he's a very strong hero, and a great damage dealer.  I'll be sure to update this as I play more, and more cards come out that he can find valuable!