Quoted from DCFAN:

We previously formed a thread for these issues:
https://pinside.com/pinball/forum/topic/avengers-code-wish-list
The things that I feel would improve the game the most are:
-For the Vs. modes, allow the user to go in the settings and select the number of shots required to win each Vs. mode (I believe there is already a setting for the amount of ball save time for Vs. modes which is good, but it would be much more fun to be able to also set in the settings the number of shots required to finish the modes to make them more achievable based on the player's abilities)
-when extra ball is lit make the Black Widow shot send the ball to the Hulk VUK/scoop (make an option in the software for the diverter to divert and send the ball to the Hulk VUK instead of the left habitrail/inlane). Trying to shoot the scoop/hole directly for extra ball is frustrating and pure luck most of the time
-Lower the multipliers that the Nick Fury shot awards by about half (those multipliers are far too unbalanced in relation to the rest of the scoring)
-double the multiplier bonus for the pop bumper lanes to make them more valuable (there are six pop bumper lane lights so it is not easy to rack up those multipliers so why not make them more rewarding)
-combos would add some extra fun to the shot making and since the shots are tight they could be made a little more valuable than most wide open games (the menu system already has placeholders for combos), also initials for combo champion and maybe best combo like in spider-man
-Attract sounds when flippers pressed (as simple request)
-Thor flasher bug
-Fix the H target reset problem as described in the posts above
-Battle for Earth add animations
If Stern did those changes to Avengers I would never say another thing about the game needing anything (except if a bug was noticed of course I would let them know).

Quoted from jkdblaze:

What about a ball save on AOTH? Nothing like finally completing Black Widow (and all the rest) only to insta-drain on AOTH.

Quoted from frolic:

Not sure if it's been mentioned in this thread, but Avengers has a tournament weakness, competition players shoot Loki all day long. The left orbit will keep building towards Loki MB, and Hawkeye VS MB... so it's a "safe" tournament strategy. I wonder how this can be addressed? Somehow stopping both Loki and Hawkeye from requalifying if they don't do anything else.

Quoted from frolic:

One other tournament issue is the ball lock gets confused, can give extra balls when not supposed to, especially in multiplayer games.
Maybe an option to turn off physical ball lock, have a virtual option.