In real life, Superman would be immortal. There would BE no kryptonite so, nothing would be able to beat him.

In real life matter cannot go faster than the speed of light. The Universe may be expanding faster than the speed of light but nothing can move faster than the speed of light.

The tachyons that concidentially make Doctor Manhattan unable to see his future are theoretical at this point. Their existence has not been proven.

The fact is that Superman in real life would have a lot of his powers stripped off him and most likely his real version would end up getting his ass kicked even by Ronda Rousey.

1. Nope. It is irrational to assume that Doc's abilities are greater than they have been shown to be.

2. Doc has only reconstructed himself from being torn into atoms.  He has never reconstructed himself from having his atoms torn apart.  There is a precedent for Superman tanking that which should tear someone's atoms apart.  There is no such precedent for Doc.

Doc would wave his hand and nothing would happen.  Superhuman durability: Superman has it.

3. I'm not giving Superman any prior knowledge.  Superman only knows what he canonically knows and same goes for Doc.

4. Kryptonite does not exist in Watchmen canon; Doc has no idea what it is or does.  

5. Superman never had a single canonical fight to which he lost against Batman.

Nice try, though.  Next time, show us something that Doc has actually done which compares to Superman's feats.  Doc waves his hand.  Nothing happens.  Superman punches Doc into quarks---Doc has only reconstructed himself from atoms.

Superman wins.

1) You don't assume against or in favor then no problem.

2) You cannot assume Doctor Manhattan can't separate Superman's atoms. Doctor Manhattan manipulates matter, Doctor Manhattan moves his hands and someone needs to go for a broom to give Superman a proper burial.

3) If no one has prior knowledge then Superman can't know about tachyons. Doctor Manhattan will know every single movement Superman will make because Doctor Manhattan can see his own future. Everything Superman tries is futile.

4) Superman doesn't exist in Doctor Manhattan's cannon, neither does Dr. Manhattan in Superman's. That's a weak card from you. Dr. Manhattan will turn Superman into pieces as he controls all matter so kryptonite is not even necessary. It was all about you using prior knowledge.

5) You say those fights don't count because they aren't cannon? I say they count. You are in no better position than mine to say what counts and what doesn't. You can say that Superman has been defeated by a human, there is no way you can say that Doctor Manhattan has been defeated by a human.

Doctor Manhatta wins.

1. Nope. Abilities and feats are judged at the the levels they are used.  Doc's are too weak.

2. It's not an assumption, it's the application of a power that Superman has and routinely uses to tank for more destructive attacks.  Superhuman durability.  

3. Never said he knew that.  

4. Nope. Superman tanks it.  Doc has never demonstrated anything near what Superman has dealt with before.

5. " You say those fights don't count because they aren't cannon? I say they count. "  Well, the rights holders over the franchise disagree with you, so you're wrong.

Superman wins and you've brought nothing new to the conversation.
Do better or I'm just going to ignore you.

So I've been reading a lot how Dr. Manhattan is basically indestructible but then I thought, what if Goku gathered all the dragon balls and wished that Dr. Manhattan never existed? That means technically Goku can defeat Dr. Manhattan pretty easily, wouldn't it?

1) No Manhattan is way too powerful for Superman.

2) Superhuman durability doesn't prevent Doctor Manhattan from separating his atoms.

3) Nice. You didn't argue anything against the ability of Doctor Manhattan of knowing every move from Superman because he can know his own future. Of course, you can't argue against that, there is no argument. There is nothing that Superman can do that Doctor Manhattan can't know.

4) There is no point you bringing here for arguing. Doctor Manhattan controls all matter, that makes him incredibly powerful, even Superman is made of matter.

5) Superman has been defeated by Batman. I don't care who says those comics don't count. That was Superman getting beat by Batman.

Ignore this post if you want, I don't care, it makes no difference.

That could be possible but Doctor Manhattan can see his own past, present (duh) and future so the moment he sees someone is trying to wish him away he could teleport there and prevent it. :D

Shenron can only grant wishes that are within his power

Hey Grimm, not saying that Spawn wouldn't beat Batman but those pics are from two different stories. One is Spawn/Batman (where it was a draw... but Batman did end the comic splitting Spawn's head with a cheap shot) and the other is from the regular Spawn comic.