the only stuff that annoy me with light vehicules is how powerfull they are and how squishie they are...
making them relevant for a short time but uber strong... then almost useless which i find annoying
I think a lot of that has to do with how fast light vehicles come out. They can be pushed out so fast most players are not ready for them and causes a lot of shock factor that can easily win you the game. Instead of natural progression to countering LV's you get these rabid scrambles to anything to fend it off and stabilize or lose the game trying. Then once you stabilize its like you said, they become so hard to use that only their utility makes them worthwhile.