Looking to grab the trilogy, not just for Multiplayer though but for single player as well, is single player good?
You will find a game easily (Europe/North America region) all the time , even low ranks only games , except at 8:00-11:00 AM GMT.
KZ2 Has around 210 players online , there is no counter in KZ3 though.
Single player? Multiplayer is where it's at.
KZ1's single player's good, I don't even remember KZ2's other than the bosses. KZ3's not bad, but not that great. Just keep your expectations on the multiplayer, unless you care about getting all the trophies.
Best Game in UC2: 20 kills, 0 deaths in The Lab. (thanks to default pistols and grenades)
Best Game in UC3: 20 kills, 0 deaths in Classic mode
Reformed Xbox Player (6/23/13)
Online/Co-op: Battlefield 3 - Saints Row 3 - Killzone 2&3 - LittleBigPlanet Racing - FFXIV [Beta]