To cut to the chase, I did not like that Gru won. Based off the little clips that they released before the episode dropped, I thought this was an assured Megamind dub. However, when I watched the actual fight itself, I couldn't help but be severely disappointed.
Let's look at some of the reasons they let Gru win and why I think they're absolute horse crap.
Firstly, they said that while Megamind has more weapon variety, Gru's gadgets pack more of a punch and are easier to use, specifically the shrink ray. I'm sorry, what part about a gun that can "de" anything makes it hard to use? Also, did you see how long it took the shrink ray to work on the Moon in the first movie? Yes, the moon is a very large body compared to a person but aside from Megamind's death ray, none of his (Megamind's) gadgets take that long to warm up.
And in the battle itself, the shrink ray and the death ray are used the exact same amount of times (once) so this point barely means anything.
This isn't even mentioning the fact that Gru's gadgets have been countered by other people numerous times and he even had to borrow some from the AVL to become a better agent. Megamind's gadgets are all homemade and outside a few glitches, he hasn't really been surpassed by others technologically speaking (outside Machiavillain).
And look, I know we're using cartoon logic to explain why Gru was able to survive the death ray (and his clothes apparently) but there's no reason as to why the de-gun and the jetpack he pulled out of nowhere should have survived the blast.
And even ignoring both the death ray AND the de-gun, Megamind should've still won cause of his Metro suit. That suit would allow him to overpower all of Gru's super minions except the laser one (who they didn't even use in the fight) and the stretchy one (who was only used as a slingshot). That was an instant win right there and they straight up forgot it despite bringing it up in Megamind's breakdown.
And we have the last thing that really ticks me off. Gru only won by using Megamind's gadgets against him. Not even by his own merit (again, Megamind's gadgets are supposedly trickier to handle).
And before you bring up the point "Megamind is more cocky thus would lose in a quick draw", we have onscreen evidence of Megamind locking in during fights. He's only cocky when he thinks he's won (if he was gloating or had his back turned after the death ray went off, then I'd see that as more in character but no, he was looking Gru dead in the eye as he had his own de-gun pointed at him). He didn't even get a fire arm to have a chance to "shoot first".
And yes, Megamind has attempted to talk his way out of situations that would normally screw him over (and failed) but even then, he usually has some contingency or backup plan to ensure his own safety so him trying to talk down Gru at the end with no wild card also feels out of character for him.
Tl;Dr, I hate that they took cues from Megamind Rules into account when that show is donkey balls and shouldn't even be canon and it just led to most of this fight feeling silly. To this day, it's still ruining the blue GOAT's legacy.