Let me be the first to say that i DO judge by the standard of a team's kit, not because it inherentl means they are bad, it tends to give you some clues about what they are like.
If a team is dressed up in camo and weilding inferno's, spyders, ancient mags etc. it tells you that they are likely to not be very experienced in the world of tourney paintball. When i played my first tourney we had a real mixed lot equipment wise, but it was mostly spyders, inferno's and the like, and we got completely outgunned & therefore were at a great disadvantage. In a couple of tourneys most had upgraded their kit to a much better standard, and anyone who has been playing tourneys for even a short while will get the it they need to succeed.
This is a problem in the UK tourney scene in that we really have no tournaments in which you can get away with using low end kit, just look at the Div. F teams in the MM's last year, 90%+ of people were using angels, impulses, e-blades and the like. Even playing rec-ball you tend to get hammered if your using sub par kit, it took me one walkon to realise that an inferno was just not enough to play with.
The second reason you can judge them is that you know that they aren't gonna be able to put as much paint in the air as you when your playing. In sup-air, it is a real disadvantage to be outgunned, and it gives your oponents an edge.
Just to qualify what i'm saying, i don't automatically see a team using low level kit and start laughing & pointing and ywlling 'noobs!!' and assuming they are awefull players, because only cocks do that, i just think that you can tell things about a team by what they use.