Snipers

Apart from sentry guns, snipers are a scout's worst enemy. I'm no talking about normal everyday snipers, but the good ones, the lpbs. For a scout that's on a modem, these guys are bad. They frag you especially when you jump off the corner in the sniper nest in 2fort5 to the court yard. This is because they always aim there when they are no enemies in their site.

How to avoid:
If you get killed , at the most, twice by a sniper when taking the same route, maybe it's time to try other things. In 2fort5, you can go under water. The scout is fast and won't drown.
Another thing you can do, is to strafe, dodge and jump. Strafing is basically moving from side to side when facing the sniper. Dodging goes with jumping, basically jump around randomly so the sniper can't get a fixed aim on you. Jumping from side to side is the best when moving towards the sniper.

For poor snipers, I mean those who aren't that good, but get some good kills now and then, try shooting at them while you run. shoot and strafe from side to side at the same time. It is next to impossible to do this if you are a keyboard player. When you shoot and hit them, getting hurt will sometimes make them back off. Especially if you have good aim and get allot of nails in.
Don't try this technique with the good snipers. They will usually kill you even if you do this.

 

Bottom Line:
Avoid snipers that kill you allot as much as you can. Try taking alternate routes. Never stay sill in the view of any sniper. Always look in their direction to see where they are, and keep a fixed look on them if possible. If they are out of you site, you might not know exactly which direction to strafe in.
Always try and run backwards when coming out to the courtyard with the enemy flag. Spot the snipers and dodge.

MEGA-TF

Snipers aren't that big a threat in MEGA-TF. This is because of the scout's jetpack. The scout can easily leap over areas where the snipers are guarding. He leaps high and fast through the air, so it is hard for the sniper to keep a fixed lock on him.

This doesn't mean that they aren't dangerous. They still are. Especially if you are in cramped areas like tunnels etc. Then you can't do anything else but dodge, just like in TF.