In a nutshell :
C ability - makes sentinels on site useless (suppress + info)
Q ability - good and you can do lineups with it, great combo potential
E ability - literally stupid, you can break KJ lockdown with it and it does insane amount of damage (as per TenZ's livestream going on right now), also it's point and click so you don't need any lineups
X ability - literally INSTAKILL if you're on site and get hit by it, forget Breach's cosmetic ult, this is the real deal