Wolverine is outdated
Wolverine simply couldn't stand the test of time and got outclassed by every single post-launch character. You have reasonable chances of killing any of the season 0 tanks quite easily, but the tanks that came after the game's release are 4x harder to deal with.
Thing's shift ability deactivates your entire kit (aside from your howl)
Emma can just grab you after you kidnap her and takes reduced damage while in diamond form
Angela flies, no further comment
Rogue, even though not the worst, is still kinda tricky because all her skills cancel your shift and right click, she can outdamage you and can steal your damage and howl
Devil Dinosaur... you already know
The only post-release tank that is kinda countered by wolv is tankpool
Another thing is that the game incentivizes you to play wolv as brawler, since he has to build up rage and needs to be on the frontline anyway because his targets are the tanks, but he doesn't have the tools to survive said brawl without the constant help of the supports. So, seeing this, you try to play him as dive, but guess what? you can't build up rage like this, so you don't have a reliable way to deal enough damage.
His kit is a mess and that makes him pretty mid in everything he tries to do. Can't brawl, can't dive, can't play neutral.
I'm a tank main by nature (lord on angela, mag, hulk and grinding for rogue), but wolv is my second most played character, so by playing on both sides I can say without a doubt that our boy needs a buff. My suggestion would be a lifesteal on his quick strikes after the kidnap, that way he can be more independent of his team and brawl more efficiently, not to mention it would fulfill the fantasy of "undying berseker" that he so miserably fails to achieve.