To be fair - the characters on The Avengers playfield aren't poses of real actors...they're artistic renderings. Painted in Photoshop for sure, but renderings none the less. My issue w/ Avengers art is more the fact that it's all style guide art for products (toys, stickers, shirts)...just plopped on a playfield. It could have been SOOOO much more interesting with some kind of actual action scene...Ironman blasting a laser & Thor throwing his Hammer at Loki...Loki dodging. Captain America & Black Widow fighting an alien. They could have incorporated inserts into the art. Ironman's eyes and chest are SCREAMING for inserts!!! They didn't do it on IM and didn't do it on this game!
In any case, "product art" can look good if implemented well. I think Tron looks beautiful. Stark, stylized, clean lines to guide the shots. It works for that game. I think LOTR looks really good, too. Sure, that one is literally the actors...but it's incorporated in an artistically cohesive way with the map of Middle Earth, the ring inserts & all the other details. Sure it looks different than a 90's B/W game...but I think it really stands out - in a good way.