In an actual war do you think anyone has a problem at destroying an enemy base to the ground to gain a strategic advantage?
I really do think base camping is a valid tactic. If you're doing it alone you're probably going to be taken out really quickly, if your whole team is doing it then the other team just can't compete and probably wouldn't be able to get the objectives anyway.
Also, being spawn raped can be fun if you have at least a competent squad. It's fun trying to sneak out, and if you manage to do it you have a good shot at taking the objectives.
I'll give you an example. I was playing a couple of days ago with Olimpia, Ejas and some fellow gaffers against a pretty annoying team (both teams had the same amount of players, and lvl. wise were pretty even. One squad of veterans for each side, and the rest were low lvl. players). We easily won a rush game defending on Canals, never lost an mcom but then it was our turn to attack.
Canals is a map were the defenders have a really solid start up game. Both mcoms are really close to each other and you get the Tunguska which in capable hands is a death machine.
We managed to take out the first mcom in the open pretty quickly, but the one inside the warehouse was hard. The whole enemy team was defending it, the Tunguska driver was competent. They took out every chopper and Armtrack that get close to the mcom.
Eventually we managed to take the mcom with less than 30 tickets remaining.
The second set was equally hard, but we managed to destroy it. Then the fun began. The enemy team began to spawn rape us on our base at the third set. I died a lot trying to sneak past then, at one time me and Ejas almost managed to break free but we were chased by the Tunguska, a humvee and 2 players on foot.
As soon as I was able to spawn again, I saw that a lone gaffer had not only managed to sneak by, but he was standing next to the B mcom (the hardest one inside a garage) waiting for us. Our whole squad spawned on him, armed the B mcom and went to arm the other one (A, next to a container house).
The defenders didn't have time to come back to their base to disarm, and we took the base with more than 50 tickets remaining. No one attempted to disarm because they were all too far away.
After that the attackers couldn't coordinate anymore (they didn't know if they should advance to keep us away, or camp at their base defending the mcoms and wait for us). So we took the last two bases quite easily.
If they didn't spawn rape us at the third set, they had a shot at winning the game as the Tunguska driver was still alive and murdering the noobs, and they had a really good MAV player that spotted (and killed) a lot of people.