Accomplishments:
Outsmarted and defeated Vegeta
counterpoint: he's so smart but ended up dying because he wasn't smart enough to realize the same way vegeta shouldn't have allowed him to reach his perfect form is the same way he shouldn't have let Gohan get angry enough to achieve SS2
The whole android saga was pretty much just nikkas playing with their food and not finishing their plates
Vegeta could've killed cell, but he fukks around and actively tries to make cell stronger, and then gets his ass beat
Goku has a full on battle against Cell, and then wears him out enough that cell is actually tired from their fight. Goku proceeds to give him a senzu bean
Cell can clearly kill gohan and everyone watching the fight, but he gets intrigued by gohan's bad temper and fukks around trying to get him angry
Gohan achieves SS2, and outclasses Cell easily. Even hits him so hard he spits out Android 18, and loses his perfect form. Gohan STILL doesn't think it's enough to just kill him so he continues to toy with cell until he blows himself up, killing Goku and King Kai in the process. Cell is able to regenerate and thanks to the saiyan cells in his body, learns Goku's instant transmission, and comes back to earth even stronger than before zenkai-boosted
just complete dumbassery from all the main characters