Psychologically, don't be intimidated thinking others are all better. They are just playing too. One of their tactics is to rush in rapidly and attempt to push the opposition to the wall, BUT, realizing it is a mere game and nothing happens in real life, and you lose no money, and you win no roses, just charge in and rush them back, sneakily or otherwise. When one goes for it it seems to rally the rest of the team to jump in and take control. Such tactics have garnered wins by lower level makeup against teams made up of level 40-50s,. As the saying goes, brains over brawn.
And remember, only (.01) more than than the "bad" guys is necessary to take the win.
Learn sneak attacks. Nothing gives greater pleasure, outside trashing their attitude with a win, than squeaking up behind a snipe or a bucket blaster, and splatting their keester back to their base. If you practice, you can scoot around and get them several, or more, times in a match.
Other enjoyable tactics, if you are fed up with no wins, is to grab that E Liter, find a good vantage point, and keep shooting long distance ribbons out there. While your team may not win, it does ensure the opposition CANNOT get a perfect score. This especially deflates their miniscule egos since perfection is what is sought, and it keeps them from that goal. Besides that, a big ribbon, or dot, of a odd color in an otherwise full field wacks the sensibilities of the obsessive-compulsive groups.
In addition, getting good at sliding around and taking these characters out, will naturally create animosity. If you need proof, try targeting a particular character, one of the members that use buckets, for example, and slide around, spraying your own color just enough to get you to their location, then whack them. Move away from that area, watch for their movement to another location, or the same, and slide in again, wiping them off once more. Do this several times, then, when the match ends and you are asked if you want to continue, do so. In all likelihood, the angst you set up will be revisted upon you by your former victim, if they joined, because they must get back that confidence you so handily blasted out of them previously.
Therefore, if you are a benevolent individual, by all means, rematch with your mark so he or she can regain face, or try to, however, if you are one who enjoys shoving their wounded ego into the salt, as soon as the match ends, you know, the one where you dragged their butt all over the place, immediately decline the rematch and move on to new horizons. They are left only with the memory of the shame you heaped upon them, and the fear that it may occur again.
In closing, a final point to remember, get good with the tools that actually require skill in their use, i.e., the ones requiring aiming, and remember, it takes very little skill to splash paint around with a brush or a bucket.
Don't let them get you down, win or lose, you level up. And instead of lamenting a loss, HARASS THE HELL OUT OF THEM.