Oh believe me, I have lost and won games by abandon myself. 4 total maybe?
But vast majority of them were pre abandon "nerf", as of now, unless you dived a single suicidal vehicle and basically given it to enemy/he gave it to you, its not even possible to recover it against equally skilled opponent who wasn't completely forced off the field.
The mechanic basically decides the games in so tiny, minor, insufficient % of games that I see this whole thread as little more then another "I lost one game, I think I lost it because X, therefore I will rant about X to have it removed" kind of thread.
Take literally any tournament we've had recently and count how many games were won or lost because of it.
You'll find out that this is not an actual issue, but a result of people running out of things to bitch about.
Abandon by itself is obviously a fairly minor thing in the grand scheme of potential problems mainly due to the fact that it's a rare occurrence. But the fact it can decide games by itself, especially games where you can make an excellent aggressive play and have it all washed away in an instant leaves a very sour taste in my mouth in particular.
Coh2 is in a great state right now despite the bitching. But when given the opportunity to improve even a relatively uncommon issue I would jump at that opportunity, especially one that could add new dynamics to the game, if even only in a small way.