Battlefield Bad Company 2 had the worst case I've encountered. The spawn points are set in the game, typically 5. One home base for each team and 3 posts to capture. If one side has all 3 posts, the other can only spawn at home base. There are also attack helicopters, tanks and excellent sniping positions. Particularly on one map that has you in the middle of a flat desert.
Which means, joy of joys, the winning side can now spawn kill like nothing before. Two jackasses take the very fast and highly maneuverable heli and circle strafe the spawn points so it's impossible to hit them before they've sent your sorry ass into oblivion. To make things worse, the tanks, typically flanked by support crews armed with rocket launchers, are barraging your base. This kicks up smoke, shakes your camera constantly and ensures you cannot get a single accurate shot off. If you take the time to even try to line up a shot and miraculously aren't blown to smithereens, your head will be blown off by the snipers camped out where you have no hope of hitting them.
This meant that if one side got all the outposts, the other side would immediately quit rather than bother trying. This was a serious issue that was somewhat rectified in BF3, though Metro still suffered greatly from this because one side was trapped in 3 hallways that were easily covered by continuous fire. Your chances of winning were greatly affected by what side you were on. That being said, the other side's spawn suffered to a lesser degree as it was in a glass-fronted building across a wide street that made them easy pickings for snipers.
The game itself was structured to encourage this griefing, so it's either you roll with it or don't bother with it. I don't blame anyone who experienced this degree of encouraged spawn-killing and decided this wasn't going to be worth their time.