Conservation of Terminatorjutsu
TH/SS Termies have confused me for a long time. They have no ranged attack, can't assault on the turn they Deep Strike and die to massed fire. I suppose putting them in a Land Raider helps, but that's where long ranged AT weapons come in.
Of course, everyone uses melta, which is precisely why they get clobbered. They are too close, and yet insist this is the best way to do it. It isn't.
Rhino screen with Multi-Melta works well, but i prefer lascannons (read: I have more lascannons than Multi-Meltas) In addition, due to the law of Dice Conservation, if you only make your opponent roll a few dice on TA saves, (s)he will pass it.
I really don't understand the whole TH/SS thing, and I haven't yet suffered it either. I prefer the aesthetics of Claws anyway.