IMO 2v2 is a really bad way to gauge the game in public matches. You usually end up with someone who is far worse than you are (or they are far better than you are). Sharing a bolt pool means you lose bolts anytime they die (or anytime they get a kill) so it's a tough thing with randoms. I think it's the better of the two modes, but only when played with a good team mate willing to communicate and cooperate. Outside of that, it isn't very good.
1v1, however, is a better gauge for balance and how the game works.
As far as the Warmonger, while I do believe it is better than the PBL, it is simply because of the egregiousness of auto-aim applied to rounds to compensate for latency. It allows players to fire "straight" with a very good chance that the auto-aim will adjust and launch your rockets north to hit a player, should they be close enough. The only way to effectively neutralize the Warmonger is to create distance between the two of you, which unfortunately means wasting time not capturing nodes.
Even still, some decent planning and prediction can really help you defeat a Warmonger easily. Keep away from nodes they capture, and try to stay ahead. Jungle the bolt crates early on, build Warmonger Turrets and Extra build pads at your base (and sell the turrets that come with the upgrades for a profit). From there, you can build up proper defenses, and go jungle during the squad / assault phase (unless they rush your base). Beat down their nodes, and get very fast captures early in the next recon phase, giving you the upper hand.
Here's a good video to watch for some ideas on how higher level players attack nodes:
http://www.youtube.com/watch?v=e--0p-L0cBE