With the Wraith you get 2 headshots per reload cycle
With the Claymore you only get 1
Except that the chance to decapitate two enemies in the same reload cycle is below 50 because that goddamned tincan doesn't even have a proper headgib chance of 1.0! It should be dumped in the trash where it belongs, along with all non-auto weapons without 1.0 headgib chance.
It's a cheap knock off of the ME2 claymore and it's a human design. Using it on a krogan is stupid - use graal.
It's utter garbage because of it's heavy weight. I like to pull off 6+6 combos on several classes and claymore prevents it.
It doesn't have a good range - I can't snipe across condor.
etc.
etc.
etc.
I like to talk trash abt the claymore and when you ask for it, I am not going to let it slide. 
1) It is a human design, but it is clearly Krogan in spirit. Period. So using it on a Krogan makes as much sense as having sex. It ALWAYS makes sense.
2) Not at all, if you spec properly and use the proper equipment.
3) You actually can, if you use it on the right kit.
While no kit/power/equipment is gonna change the tincan's awful sound and its pathetic headgib chance.
Bring it on 
I put in all that work to get in a refire delay joke and this is all I get back?
1v1 me scrub, I'll be the Wraith AIU and you can be the Claymore Volus Adept 
Alright, you're on! 
Quoted for much needed emphasis.
Truth. I get a kick out of some the responses though. Like - What kit do you play? ClaBOOOOOOOOOOOOOOOOOOOOOOOMMMM!!! Muahaha, HEADSHOTTTTT!!!!
Fixed.
Also, 1vs1 me IRL.