I think he's not OP so much as he sort of sets a bar for adc's: "can you be as effective at carrying as me while having a good early game?" For a few like
it's a solid no. Most others can actually pull it off believe it or not, either with utility or mobility/AoE. Draven's the best at straight-up murdering folks right now; he's basically taken Graves' role.
I agree that Death's Dance is an item that defines a lot of AD champions - I'd go so far as saying it's the Morellonomicon for AD carries - but BORK and BT aren't nearly as enticing anymore. If DD gets nerfed, other lifesteal items certainly deserve some buffs and/or changes so that role isn't left without any way to fend for itself like it was before.
If there was something ridiculous about Draven, it might be his base AS for a marksman with 550 range. Just look at it!