havent seen him much, just wondering peoples opininons

Too hard for most people to play effectively. Has a crappy late-game since a lot of players buy GA. He's also kind of a carry assassin, unlike tanky assassins like Rengar.

Never seen him must be OP. This is what GD actually believes.

I've seen Zeds fall flat on their face and Zeds completely dominate.

He's fine. People need to realize he's high skill cap and not UP.

what are his strong points?

he just doesn't seem as outstanding to me as the other recent champs, or even as good as average old ones

I haven't seen one dominate a game yet, or even do enough to scare me in any way

Hes a balanced champion, but limited reasons to pick him, over other characters. A skilled zed will do just fine up to diamond (as is possible with any champion) but as a whole, there are better champions that fill his shoes.

Using him sense his release I feel like he is a great assassin. I have gone mid against a lot of different champs and pretty much dominated other then against a kat. Late game you need to focus on shadow dashing in behind enemies and ulting the adc to be most effective in the team composition.