Regular colossus is terrible, no use as an attacker except if you are really in need of a bleed immune but even a 3 star iceman, ultron or king groot is better than 4* colossus for fights that you need a bleed immune champ. He is also a terrible defender since he is so easy to fight and is not even that tanky compared to other "tanks" in this game. Unstoppable colossus is slightly better as a defender since unstoppable is annoying to play against and he is slightly better as an attacker since he can get fury but he is still very mediocre.
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Dr. Zola