I would agree that the Cryx infantry is amazing, but just because Cryx has good infantry doesn't mean the other things are bad. Cryx has some really good support in sirens and combine being must have purchases.
Also despite negative endorsements from most people the wraith engine is a really solid heavy hitter for 9 points, much better than the seether. Being able to switch incorporeal on prior to the engagement turn basically guarantees you will be alive the following round to kill stuff.
I don't like the slayer, corruptor, seether, desecrator or erebus. Other than that the cryx arsenal of jacks seems fine.
All the lights are amazing and there's no reason not to have 2-3 of each at some point.
The reaper is much better than the slayer and has its place, harrower is great in general and extremely good with Mortenebra.
Nightmare and Deathjack are both extremely offensively potent and when you prey a heavy with nightmare and drop something like parasite you easily one round just about anything, 5 ps 21s is pretty legit. I personally hate deathjack but he's okay.
Cankerworm is very survivable and mobile. Parry and pathfinder along with some AP can hurt people dead.
Also levithan is really super sweet, burst shot against heavies or cav is really amazing, also using one with mortenebra can pull out some janky assassinations, overrun a jack have it kill something walk the levi into range, mortenebra walks b2b and feat, siren boosts, 3 full boosted guns with rerolls.