Let me add some missing points first:
8. Your combos are very gender specific. Most of them will not work on female characters and some mid screen ones will force you to spend meter for male ones.
9. One of Sub's variations is trash regardless buffs.
What you should gather from reading Sub0 forums only:
1.You have an almost half screen overhead that I have seen no one to punish it - you haven't seen it, but I have. This argument is meh and can go on forever. B2 might be hard to punish but it is doable.
2.You have insane damage potential when the opponent is cornered. - Dmg in corner is ok. Midscreen is not that cool. Most characters have ok dmg mid-screen as well as in the corner. This "insane" is stretching it a bit.
3.You can do with the clone whatever you want,throw it,smash it! - or fail to cancel into MB version of it. Yeah, this bug is still there. From what I know only one string is consistent. All the others are risk - clone will come out, or not, or will not come out and cost you meter (and eating combo).
4.You have the best cross up and jump in punch in the game. - this is why every tournament player picks up Sub0! This is arguable. I'd say it's good, but if it's the best? Kotal's punch in beats the Sub's one if you ask me. Other ppls might have different opinions.
5.You kill the opponent's footsies when the clone is active. - This is why so many ppl are crying about Sub0, being blind to what he needs to struggle with.
6.You have 8-2 match ups. - As well as few losing ones against most of the top tiers and some middle tiers. In the perfect world Sub should have only even match ups. And again, you can say this about most of the cast.
7.Whatever is punishable can be cancelled into clone. - except MB clone doesn't come out constantly which was already pointed out. As for normal clone cancels, whereas you can cancel into normal clone from F33 mid-screen it will not work in the corner on female chars and sometimes on male chars, all due to proximity check. So no. It's not that easy and you never know how it will turn out in the corner, where GM Sub's game starts.
I don't want to argue. I put MKX back for a while, but I'm still reading my mains forums to know Sub0 ain't that great as you picture him. Most of your arguments can relate to any character tbh.
Edit: and all of them are steaming from point 5 - GM Sub's main tool. Yeah, it changes game play for many and this is the problem for you guys. It looks like you try to cover this with picking other arguments that: can be related to most of the cast or are not entirely true.