I don't think its THAT bad. I don't particularly like the lower half of his face, but its way better than that last SKINNY face'd bust sideshow made. Lots of detail, love the look of the suit on his head, he's thick, super muscular, the materials etc.
No idea who approved the Hulks face though, looks like he has Bells Palsy.
Actually you nailed it. The mouths are the problems with these pieces. if you cover up Wolverines lower uncovered half he looks amazing, same with Hulk. Deadpool looks fantastic, again because his mouth is covered. Lots of detail here but the mouths are definitely not pleasant to look at.