In terms of no weaknesses, Wolverine's only weakness is Magneto, but then there's Deadpool who has Wolverine's regenerative abilities but, as far as I remember, isn't full of metal, so he can't exactly die. Then again, Apocalypse did like...melt Deadpool, and Cable had to eat him for them both to survive.
The Silver Surfer is pretty invincible too, you'd have to remove his cosmic energy to defeat him. Heck, he annihilated an entire planet of Symbiotes (y'know, like Venom and Carnage) purely because he knew they were evil.
Plus he can seal his enemies in a frozen space of time so they can't move or act.
Cable sans Apocalypse's Techo-organic virus is the most powerful telekinetic mutant in existance, a man who disassembles houses subconciously, so if he wasn't stuck with using his powers on that, he'd be pretty much invincible.
Also, as far as I remember, in the current DC line, Superman is no longer invincible, just very strong and very hard to kill.
I think he was invincible when he like, fused with a sun, and then he was split in two because he was two powerful, and then recombined and he wasn't invincible any more. I dunno, DC gets too confusing sometimes.
So uhh, yeah, not much point to that other than pointing out that Superman really isn't THAT fantastic.