It has a hp advantidge over the avre and a total damage advantidge wich lets it do a bit better vs vehicles but the avre is better vs inf with a bigger one hit kill radius. It has a speed advantidge as well i believe over the avre.
Any unit that can insta wipe squads consistently in one shot feels cheap. I get that it would be a lot easier to deal with in 1v1, but in teams games your units will always be closer (confined up in your sector of the map, no not blobbing). An AVRE screened by infantry is a great tool to break up your opponent's lines without firing before picking off a squad. To be honest I'd like to see the AVRE have the exact same stats as the Sturmtiger. People will defend it saying the fractions are nuanced and make up for it in another way. These are both meme vehicles and I wish their purpose would change entirely (Maybe lessen there damage/squad wiping potential in favour of more stun/suppression?)
Sorry for the bad grammar.
PS: Looks like there is never go to be another balance patch. No real point in hanging around. Just wanted to get it off my chest I guess. Take care!