It's remarkable how so much of the roster is completely useless beyond the virtually inconsequential team bonuses.
Most of the characters are better than you give them credit for.
Here are some teams I've used to get past the first 10 stages (
All T1, gears ranging from 17-20 for main attackers, most characters without ISO sets, always with best uniform equipped):
- Black Panther and/or White Tiger solo floor 1 with ease
- Armor Wars team (War Machine (L), Iron Man, Blingpin) for early combat rumbles
- Ronan (L) and 1* Black Dwarf for early universal relays
- Black Bolt (L) and Ghost Rider (Attilan uniform is a must) for early universal relays
- Hulkbuster (L), Hulk, Red Hulk for early speed relay (the one that's the same as floor 1 if it pops up again)
- Silk solo for early blast relay
- Luke Cage or Jessica Jones (L) + two strong combat characters (Venom, Giant Man, Moon Knight, Iron Fist, Shang-Chi, or Blade) for early speed rumbles
- Wiccan (L), Hulkling, and Vision for Male/Hero relay
- Songbird solo for combat relay or rumble
-Yellowjacket solo double Destroyer villain floor
- Ultron (L), Red Skull, and another villain of choice for the double Destroyer villain floor
I've intentionally left the best characters off these teams. You all have T2 Sharon, so that's an easy floor clear. Loki is another even at T1. If you have Carnage, Hyperion, Enchantress, Ironheart, any BO characters, or Strange, you can solo a floor with them all as well. Then it comes down to the various characters you guys have chosen to T2. For me, T2 Widow clears the Loki stage. T2 Elsa can do any speed stage that doesn't have damage reflect. With Bullseye lead, she can do the Rocket boss stage as well. T2 Thor, Jane, Angela, and Captain Marvel can all wreck early stages too.
Small but important tip as well for those that have low rank Dr. Strange. His 2nd skill wipes off the buff on enemies that limits damage on each floor. Lets say you have no one to beat a villain stage. Bring in a strong character and throw Strange onto your team to use his 2 skill, then switch to your main character to finish the stage like normal.
Beating SL floor 15 weekly is a pretty big tipping point for this game and I highly recommend everyone works toward it.