They adapted the time he wanted to be cured from comics, that is Scorpion.
But that didn't come out of nowhere. It was only after many battles and many defeats and many downsides on his life, when depression finally hit him.
In SM1 he's not a guy who wants to fight and do super villain mischief, he's just a paranoid idiot laughing out of hysteria, removing his laughter and redesigning him doesn't mean he's a different character
But having him teaming up with Spidey, when he first denied it and tried to kill Spidey, does make him different. Not only that, but the entire origin they gave him in both games and his behavior, whereas in SM3, he is portrayed more as a tortured victim rather than a villain.
EDIT:
Scorpion: "I hate this suit, I HATE IT"
How have I been wrong, they are different, very very different, Scorpion from movie 1 game wnats to get rid of the suit, Scorpion from Movie 3 wants something different
Funny how both seem to hate being Scorpion. Odd, isn't it?
Not at all, but similarities doesn't make them the same character. They also have a tail and they also shoot blasts from that. They still have different personalities.
Scorpion: "You won't take me back"
Guess he was captured and gone back in SM3, and they mind controlled him for some unidentified reason, no?
No. Scorpion escaped in SM1.
In SM3 he was created once again in a lab. They just ignored the SM1 Scorpion and created another one.
Check out the amazing fight, he can evade you with long high jumps, and Spidey with his tiny jumps hard to catch
Same with SM1. He jumps to a pilaster and if you don't take him out of there fast, he shoots a concentrated blast. Even his normal attacks deal a lot of damage. We can't just face him normally. We have to resort to quick and functional combos and web attacks, since standing in front of him throwing just punches and kicks won't work as well and he'll catch us. In SM3, we have to mount him to grab his tail to shoot those things in the bridge while he barely does anything to take us away from him.
the better game, the better fight, much better than the fight where Spider-Man is actually amazing and attacks in the air, better than strong charged attacks, better than damn rage mode where attacks are 8 times or sometimes more powerful
You're just gonna keep pushing, won't you? ''This is the better game, everything here is better, your complaints are bs, you're wrong, wrong, wrong...''
This is better to you. It doesn't make anyone else's complaints any less valid when it has any ground to it.
Scorpion has a different personality here, isn't that right?
Absolutely, which is expressed when he is in control of his body.
Scorpion isn't controlled by mind devices in the comics, neither in SM1.