Both Hexblade and Pact of the blade spend way too many resources just playing catch up to your basic Agonizing Eldritch Blast spammer. I know ther's some multiclass stuff you can do to make it more viable, but in general it just seems like its not worthwhile.
Great weapon hexblade under Devil's Sight gives a lot more damage, that blast spammer. Especially as Half-elf\Drow with Elven accuracy. I did math on hexblade once. And i don't speak about eldritch smites on 19-20 crits, that can give even more damage
