1. Pick the right team. The best team for this level is Iron Man, Thor, and Hulk. Iron Man can deal heavy damage from a distance, Thor can stun enemies, and Hulk can take a lot of damage and deal heavy melee damage.
2. Use your abilities wisely. Iron Man's repulsor blasts can be used to damage enemies from a distance, Thor's hammer can be used to stun enemies, and Hulk's Thunderclap can be used to damage enemies in a wide area.
3. Focus on the gamma monsters. The gamma monsters are the main threat in this level, so you should focus on taking them out first.
4. Don't let the enemies surround you. The enemies in this level can be very aggressive, so you need to make sure that you don't let them surround you.
5. Use the environment to your advantage. There are a number of objects in the environment that you can use to your advantage, such as barrels and crates. You can use these objects to block enemy attacks or to damage enemies.
With a little bit of strategy, you can beat level 2 of The Avengers vs gamma monsters!