Whats up with Mikey?

[Refractive Reflections]

Originally Posted by Bossa Nova

Anyway, to answer the original question, I don't have any problem with the way Michelangelo is currently being portrayed. I knew quite a few guys like him in high school, it's just a personality type that's a little more "lost in his own world", but that doesn't necessarily make him stupid.

I would have to disagree with you Bossa Nova, 1987 Michelangelo would be more "lost in his own world", he had his quirks and eccentricities (i.e. obsession with pizza, surfer slang, and surfing).
With Nick Mikey... he's just frankly... dumb, because he doesn't really "think" through what he says or does unlike the other three Turtles:
1) Mikey wanting to tattoo his face in the first episode to use it as a "mask".
2) In the Parasitica episode, he was trigger happy wanting to shoot anything moving with the Shellraiser.
3) Mikey was thankful and proud for Splinter saying that "Mikey does not think", after Splinter was trying show Donnie not to overthink his moves.
4) Wanting to eat pizza even while it's hot and burning his own tongue.
5) When the Turtles enter the school and Leo tell Mikey to use the water on that robotic teacher, and Mikey instead praises the water fountain's presence in the school.
6) Mikey plays the "color game" asking Donatello to guess what's green, and Donnie says "is it Raphael again?"; and Mikey yells "Man you're good at this."
7) Mikey comparing Leo's heartache in losing Karai with his realization of leprechauns.

Even just looking at some YouTube clips of Nick's "Mikey moments", half of them is Mikey acting dumb to the point of not having common sense. With that being said, I can see why Raph would feel the need to smack Mikey around then.