I'm in the minority on Pinside, I do not like IM (there, I said it... ). I love the Marvel theme but the gameplay isn't for me. If I want to play a fast, brutal and shallow game, there are cheaper games in my collection that fit the bill.
I do love Avengers. The shots and callouts are awesome for a Marvel fan.
If you do try AVLE, add a $100 external powered subwoofer, swap all the flashers to LEDs and enjoy the awesome light show. The color changing GI that switches based on mode adds a ton to the immersion into the game. AVLE has great lighting effects that are integrated into the theme perfectly.
If you find it too hard, set it to easy. The "wood chopping" feeling of having to hit each Avenger shot many times is greatly reduced.