"Bad" is a relative term. You can list all his strengths and go "...yeah... that'd be okay" but if you look at other choices he's terribad. Hint: words like terribad are exaggerations.

I still think that Evelynn is a better hero than Nunu.

Evelynn is better defined at her role.

Nunu is not.

I played him today did good, got a shitload of spell damage but couldn't carry a team with him. The fact that he lacks a specific role is probably the reason you don't like him. If he was clearly a spell caster and had a different ability for Q, and something spell damage oriented with W you'd like him.

But I think that's just because you like things that way Virr. Complete and defined. That's why talent points with 2/3 bother you. This is why nunu bothers me too and I would rather not play him or see him on my team.