Another engie tip:
Generally speaking, your sentry is the most expendable piece of equipment for your team. Dispensers heal and resupply your team mates, teleporters get them where they need to go, sentries just shoot stuff.
Of course, there are exceptions to this. If your sentry is the only thing keeping an enemy from taking the last control point on a map, by all means keep it up for as long as you can. But don't get into the mentality where your sentry must stay alive at all costs, and you end up sacrificing your dispenser or even yourself. A living engineer can rebuild his sentry, a dead one cannot.
Also, try not to fall into the newbie engineer mentality of building a sentry, a dispenser, and then humping the sentry all round. Once again, there are times when that's an appropriate strategy, but those times are few and far between.
Scout and sniper both rely on precision mouse aim. I've heard that players who are good at one tend to do well on the other too. I wouldn't know, I suck at them both.
Medic tip: DO NOT DIE. The other team, if they know what they're doing, will be gunning for you first. Do not let them kill you. If your patient's running off on a suicide mission, only follow him as far as is safe, then run back to the rest of your team mates. If you're charging into an enemy base with an uber, consider breaking off the uber before it's even finished so you can get out safely. If you do find yourself in the middle of a firefight, keep your patient's body between yourself and danger. You MUST stay alive so you can heal your team mates. If a medic spends half his time waiting to respawn, then his team is severely crippled.
Generally speaking, your sentry is the most expendable piece of equipment for your team. Dispensers heal and resupply your team mates, teleporters get them where they need to go, sentries just shoot stuff.
Of course, there are exceptions to this. If your sentry is the only thing keeping an enemy from taking the last control point on a map, by all means keep it up for as long as you can. But don't get into the mentality where your sentry must stay alive at all costs, and you end up sacrificing your dispenser or even yourself. A living engineer can rebuild his sentry, a dead one cannot.
Also, try not to fall into the newbie engineer mentality of building a sentry, a dispenser, and then humping the sentry all round. Once again, there are times when that's an appropriate strategy, but those times are few and far between.
Scout and sniper both rely on precision mouse aim. I've heard that players who are good at one tend to do well on the other too. I wouldn't know, I suck at them both.
Medic tip: DO NOT DIE. The other team, if they know what they're doing, will be gunning for you first. Do not let them kill you. If your patient's running off on a suicide mission, only follow him as far as is safe, then run back to the rest of your team mates. If you're charging into an enemy base with an uber, consider breaking off the uber before it's even finished so you can get out safely. If you do find yourself in the middle of a firefight, keep your patient's body between yourself and danger. You MUST stay alive so you can heal your team mates. If a medic spends half his time waiting to respawn, then his team is severely crippled.