Depends on your mood.
The day before yesterday for example. Playing Internode Karkand 24/7 absolutely hammering everything. Becuase medic was the class I played all out when I started the game to whore points, and had the most time on it, I've been playing practically medic only to rack up time and go for it as my first expert badge. Using the M16A2, I was racking up ratios around 6-7:1, hell, I was in intense combat for about 15 kills straight with adreneline rushing, I'd take shots at a person in the distance, finally get him, and then flick around and single-triple burst an incoming medic in the face without flinching.
Everything that came near me was instantly dead, grenades were absolute pinpoint and I was having an absolute load of fun.
Then that night, I was in a horrible mood due to work issues, logged into Internode Inf rotation server, noticed The_Heart_Attack, tthf, and mikeshw were playing, so I was like wow, I get to play with people I know on BF2S, sweet. Was against them on Sharqi and I figured things were going alright, got a few nice nades in (<3 mikeshw) and was doing generally ok, not as great as usual but it was still fun and I wasn't too bothered.
Then came Karkand.
I couldn't hit a thing, I could come out on someones blindside, set myself, and I just couldnt time my bursts and would get hammered. For someone that doesn't take the game overly serious, I was cursing on ventrillo, clenching my fists, I was so angry about how badly I was doing, and the bad mood obviously wasn't helping. I ended up with 1-10 and maybe 5 teampoints playing with guys that I want to respect me around here :p
Next morning, "pew pew pew", back in action with 5-1 ratios on foot and getting medals every round. Who knows eh?