with ****ty team mates, your best bet is to get "creative"...
Something I've found that works is a delayed start, IE while your team is running headfirst into the fray, find a good spot to hide and just wait. And wait. And wait. When it gets to the point where either your team is all but eliminated, their team is all but eliminated, or nothing at all is happening (usually 10-15 mins of waiting) then you make your move. If it's the first game, they'll usually forget all about you. Be patient, and unless you are spotted, you can take out an entire team that way.
Flank 'em. I cannot say this enough. Flanks are key. Even if they make a semi-circle around you, hit the far edges of the boundaries, and run as quickly as you can to the very back boundary. That way, you can come up from directly behind them and get some KO's, or at least distract them enough so your team can get in better positions. Most bunkers, natural or not, offer protection from one direction only; If you can get behind them, they will either be eliminated by you, or they'll have to leave cover, meaning your teammates will have a clear shot on them.
Two man group: It does pay to have at least one man with you. With two people, you can still move quickly and quietly, but you have the added bonus of another set of eyes, ears, and another gun with you.
Divide and conquer: This is pretty simple. In order to be the "lone wolf", stay
away from the main battles, in a manner of speaking. Most woodsball games start out fast and furious, and will eventually turn into a war of attrition once everyone gets bunkered down. If there is a big skirmish on the left side of the field, take it wide around the right side. If they are at your base, run to theirs (using a flanking manuever) and sneak up behind them. Let them get comfortable in a position, and get behind them.
Go back to go forward: Depending on the size of the field, sometimes it's better to move backwards from the break than moving forward. If they can see your base, or if they are close enough to get to your start point quickly, sometimes I'll drop back wards to the rear boundary, run it to a side boundary, and then move up. This has you protected on at least one side at all times, and prevents the enemy from sneaking up behind you.
Freestyle: The most important thing in paintball; adaptivity. If your cover is under heavy fire, leave. If someone is getting too close to comfort, eliminate them or move. If a certain tactic is working, switch it up. If it isn't, try it a couple more times, then switch it up. If you fall into a pattern, for better or worse, you become predictable. Sometimes doing the craziest, most uncharacteristic thing you can think of will get you the win. If you've been chilling the past few games, secure in nice cover, picking people off as they come to you, it's time to go Rambo and run non-stop making KO's. Depending on conditions, sometime's it's useful to run with people chasing you, then just drop and shoot. A lot of times they will run past you, and you can then start to chase them instead.
Most of all, have fun with it