I was online last night for a few hours and it's good, very different to COD though. I ranked up a few times and unlocked a few things, was always in the top 3 of my team. I found that if you run in you'll get fucked up pretty quick but hang back and pick your shots you'll be fine. When you unlock the shotgun use it on the smaller maps and don't run about, just walk round with the crosshair aimed about head height and you'll clean up

Sure I got 36 kills and 6 deaths that way.