Thanks for bringing this up, SpartanX.
We were investigating a lag issue last night. It may be related to some of the latency spikes you've seen. Can you please type "net_graph 3" in console to check your loss, and send me a PM describing what you see for "loss". Loss is normally around 0.
Also, keep in mind if both teams are at an impass and are spamming turrets, grenades, etc., you will sometimes see latency spikes.
Thanks.