Originally Posted by
Boersgard
The only reason to use claymores is to get a free stun and kill the xeno that gets knocked over.
Elder+ sentinels, spitters, lurkers, and all T3's + carriers (because apparently they still count as T3 for stun buffs) don't get knocked down by claymores, so claymores are 100% useless against them, but everything else can be dead real fast IF a marine is watching the claymore, or rushes over to where the explosion happened and gets there and shoots the alien to crit before the stun wears off.
In other words, claymores are useful early game and can get some nice kills on really dumb/impatient T1/T2 xenos, but are almost completely worthless mid-late game and especially against any T3's; the same as most other marine weapons/equipment.