Anyways, I gathered some tips from a thread on /v/ (4chan) and I want to know you guy's opinion on these. (Since I can't fucking play because mouse shitted on me)
>Scout
SodaPopper is the way to go.
Mad milk and Sandmann.
Collect cash to get 600+hp
Increase clip size
Get piercing bullets
Get Mark to death baseball and slowing milk
Tank get down easily with critz canteen and maxed sodapopper. Enjoy those 380damage rapid fire instant reloading 6 shells.
>Soldier
Beggar's Bazooka with +clip size, buff banner, enuff said
>Pyro
Oh god that airblast!
Don't use secondary weapons, it's all in your flamethrower.
>Demoman
Scottish Resistance is awesome. The detonation delay isn't a problem in MvM, but you get to put 14 crits sticky traps, and detonate independently at will.
Other ways to play it : Maxed Eyelander with chargin targe.
>Heavy
Not much to say, max that minigun!
>Engy
Two ways Teleporter is priority, allows last second saves and escaping sentry busters
max your melee speed, gotta wrench that sentry! Get dispenser radius up for all to benefit.
If a sentry buster runs up to your shit, wait until it starts ticking, then pick up your sentry, otherwise if they're swarming you, pick it up and let your teammates deal with them.
>Medic
Kritzkried, and ubercharge canteen to share with your healing target.
Don't melee the tank with ubersaw, you'd rather charge up your kritz.
With demoman, lay critz traps before round starts, your charge rate is 10 times faster.
>Sniper
Yes there's a way to be usefull as sniper.
Sidney sleeper and jarate.
Make jarate slow. Hit giants with piss gun, they fall very quickly, allowing your mates to get more time to shoot at the tank on which you make little damage. It's a very supportive role.
Headshot explosion upgrade make ennemies bleed with sidney sleeper. (so no headshot crit)
>Spy
Max out the sapper.
Get armor piercing knife.
Sap groups of robots, sap sentry busters
Backstab giants.
Also a very supportive role, you don't deal much damage, but that sapping power is golden.
Black box soldier can also work: start by upgrading that reload speed ONCE, and save the remaining cash (should be 150). once you get 500+ start boosting that damage and improve reloading and other shit when you have extra cash leftover from boosting dmg output. as a side note, only use gunboats if you intend to use RJing to increase mobility (in which case invest in some HP regen and kills heal), otherwise you're better off using a shotgun/reserve shooter(if you can use it) or the rightous bison. not sure on the mantreads though.
also as scout, don't bother with bullet resistance, you have instant respawn and gain health from cash. don't use the baby face if you are upgrading speed: the speed upgrades and the baby face don't stack, making it more worthwhile to use the scattergun at least.
and with spy, don't use YER unless you can get a backstab before they notice your existence (and they are quick to pick up!). i saw a poor hapless spy player get crushed by robo-soldiers because he didn't have a disguise. however, that same spy decided to do suicide runs for a little bit, sapping the fuck out of a few bots before dying again (and giving up on spy, i think he went scout)
as a general rule of thumb, there's a reason the kritz canteen is the most expensive canteen: the offensive boost it grants can wreck shit when used properly. see a tank? Kritz boost. see a big bot (noted by red background for icon in the wave)? Kritz boost. same goes with medics: kritzkrieg has found it's full potential, but keep an uber canteen to buy more time for yourself if you're alone with a full charge
finally the whole "dat airblast" part of pyros is VERY handy, boost the airblast so that if bots get too close to the base you can buy the team more time with airblast. i've seen it happen and it works wonders.
Edit: i meant to put down reload speed