Ok after talking to him he would like to withdraw the comparing to Annie comments, but instead compares him to Nidalee. Basically I say that Nidalee and him are similar in that both can support and damage, but I say nidalee is better damage while zilean is better at supporting. Not trying to make a new thread topic but he now said that he doesn't think zil is as good a nuker as Annie.
Nidalee can heal, grant map-awareness, and take down towers quite fast. Not to mention she's ranged. BUT! And this is a huge but; She can shapeshift into a pure damage dealer. It's a huge difference :) She's a good carry. Nice damage, nice utility, and a nice attack speed buffing heal.

Zilean should NOT be played as a pure damage dealer. Even if you could get mega-strong bombs, you have to wait 4 seconds to deal the damage (unless you double bomb, but that's not consistent nuke). 4 seconds is the difference between your carry dying before/after their carry. However, Zilean's bomb is a fantastic poke, so I think that it's viable to stack slightly more AP than other support champions (such as Janna).
Zilean is a support for reasons already mentioned above. The thing is Riot always gives all characters SOME kind've damaging move because otherwise it would be a pain to farm / lane without them and people would feel helpless. His bombs have great AP ratios so that he doesn't NEED to stack AP to be able to farm / deal some damage. I believe he is best played by taking CDR, mana, and aura buffing items. :)

Thanks to GrandMasterD for my sig!
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I said that he could do some pretty nice damage, but his primary role was more often a support then a caster, and that he could not compare to Annie in terms of damage.
SO basically, you guys know more about the game and Zilean then we do, what is your opinion?