In my last 2 AW fights against Doom on the left mini power gain / unblockable L2 node, using a 5/65 Magik, I've done 150+ hits each time. I did get 1 (yes one) crit on the 2nd, most recent fight. That's 1 crit on 300+ hits. You really need a 'guaranteed' crit champ if you want to see those big yellow numbers when fighting against Doom.
Doom has one of the highest crit resistance stats in the game. Only a couple champs like Corvus can crit against him