"I've never killed so few players in a FPS before."
Maybe you're just not that good at it? I routinely see players get 15-20 kills per session. For a 6 on 6 setup where each session lasts maybe 15 minutes, that's a lot of kills.
Maybe you've played it a long time and you've been able to see that many kills. I played it two afternoons during BETA and all that excitemente (parkour, mechs) wore off rapidly and barely sometime yesterday's night, the most I've seen from the tops have been 13 -and that's few to me. To put it in perspective, in Crysis 2 with 8 vs 8 I kill at least 20, with an average above 27 kills per match and my personal record being 42 kills in 15 minutes (team deathmatch).
And I don't stay in one place or anything coward of that sort; I play the map, with some caution of course, and finding people takes an eternity, bots are not challenging at all so I don't even care. My whole experience is based in a couple of hours (about 9 in BETA, two hours starting from level 1 in this chance to play for free).
I can totally see and understand why you enjoy it, but to me it was a disapointing experience then and now. It is not so pleasant for newcomers because the ones that dedicate a lot of hours have a lot of advantages that aren't merely skills. In Crysis 2 and Battlefield give me a brand new profile and I will play evenly against max-ranked players only because of skills -in Crysis 2 you can reboot your online profile and beat the other lvl 50 guys with all the possible advantages of weapons and modules, with you being a lvl 5 with only the most basic classes, modules and weapons available.
Here in Titanfall I get easily squashed by far advanced burn-in cards and weaponry from the opponents, still give a fight but at the end the dividends aren't that exciting to me (having killed 6-8 enemy players); and it may be my lack of mastering the game but I don't feel more powerful when using the titan.