This thread puzzles me, defending a vbase or a port by ambushing seems like a normal tactic when the hangars are down, it seems much more gamey that there is an endless supply of new vehicles when the hangars are up, this is why its very hard to capture a v base with only GVs if it is being defended.
It can be frustrating to make the long drive in from the spawn only to get whacked with your goal in sight but I consider that a feature not a bug.
For the dedender once the hangers are down the game is more realistic as now it's a one life event for him.
If we could get the numbers, one life snapshots for GVs would be the best GV action possible.