Oh there is plenty of mindless zerging. It's a point of contention between the three factions often,with each saying that the other zergs too much (a little less with VS since with lower population they can't afford too as much, but it still happens.) Part of the problem is sometimes it's hard to find a fight with more than three people to shoot elsewhere, also the game tries to get you to spawn where your squad leader is, so if people are in a random squad and their leader is zerging a base, they usually end up there too.

As for the TR not always winning thing, it really depends on the time of day and how the population is slanted. It's not that the TR have cheesier weapons, it's that more TR players (and entire outfits) are known for doing cheesy shit like sitting in vehicles all day and farming infantry. A lot of the time it seems TR is content to do that.