Show me a single situation where self repair made any difference.
Year ago it could repair single faust damage, now its useless waste of ammo.
I've been playing around with the self-repair ability and I find it's actually very very useful. Lots of times T70s end up in 'guaranteed death' positions- say you run into a raketen in a house, it takes a first shot, and you can't reverse away in time to avoid the second shot. If you hit the self-repair it will almost always have enough time to get out of the arc of any AT gun. Same applies if you run into three shreck squads- as long as the shrecks don't hit within a couple of seconds of each other you'll be able to turn around and GTFO with a sliver of health. 70 munitions to save your T70 is a bargain, more people should consider using the ability instead of writing it off.
Just as an example, I believe there was a tournament game on Faymonville where Luvnest's T70 went balls deep and ended up catching two raketen shots and dying, one on the way in, one just as it was escaping the arc. Self-repair would've saved it.