Honestly it really just depends. There are a lot of strong teams, and many not so strong. For example, in socal, I would say that Ritte is a pretty strong team (in that they race well together as a team), while Swami's seems to be a bunch of guys doing their own thing in matching kit. At the Sisquoc road race, my team together with Sho-Air controlled the race with classic rotating attack, counter-attacks and got our guys into the winning break. In norcal, at the University RR, BF's MtnRide and a bunch of his teammates worked very well together, attacking, counter-attacking, etc. and nearly swept the podium. A lot of those guys involved are 2s now, having learned and developed tactics and teamwork to succeed and upgrade.
The biggest problem against "teamwork" in the 3s isn't that 3s can't race as a team, it's that there is a failry wide range of skills and strengths. The higher up the categories you go, the closer everyone gets and there is less opportunity for a single rider to be strong enough to overcome teamwork. The other major factor is that there is a lot of more flux in the 3s, the good/strong riders, and/or the ones that figure out tactics move on and new 4s flow in. That being said, I've seen plenty of times where a higher level pro comes out and single-handledly just spanks the local 1/2s despite strong teamwork.
A perfect example of this (in a sense) is cdr's videos. While expo had a lot of strong guys who worked hard for cdr, I was also in the race and didn't do squat to help simply because I physically couldn't.