About adapting to new games

During the period when you're learning a new game, should your aim suck?

I've noticed that whenever I'm learning a new game my reflexes are a lot slower and I feel overwhelmed and somewhat Intimidated I guess.

It's what causes me to shoot team mates and react slower to enemies.

It's understandable that I would die a lot when learning a new game because more experienced players know tricks and maps, but shouldn't I be able to at least keep them in my crosshairs?

When I was younger, around 14 I used to play a lot of CS and some UT and Quake and from what I remember I had pretty damn good aim and was able to score headshots quite often.

Now, 6 years later my reflexes have somewhat slowed down. I'm sure the problem isn't just me, it's also my terrible 5 year old optical mouse meant for work not gaming and lack of a decent pad.

Is it possible that switching to slower games that focus more on team work caused my reflexes to degenerate?

How can I remedy this situations? It's really bugging me.

All games have differences in aim and sensitivity between the mouse.. play the game a bit longer and you'll soon get it.

It's a matter of practice.

I too sucked very, VERY hard when I started with CoD4.

Now I can easily get to the top scores even when I'm half asleep 8)