I want to know what everyone uses as I seem to get dropped pretty fast by these 2, but when I use them I feel so weak. Edit: and the tank if you use him.
I also need help with Gunner and Tank, but I have a good Assault build. I worked on it after a bit of experimenting: Gold: Rate of Fire Silver: Accuracy Bronze: Skill Recovery The point of this set is to be mainly a killer.You can kill bots really good with mines and level 3 charge destroys people. Having RoF for your gold will make you kill fast, and accuracy compliments this quite well. I put in Skill Recovery because I use the mine and the charge as Assault a lot. If you don't you can replace it for Speed of Armor. I would just say keep RoF and Accuracy as gold and silver to make you good killer. I spend most of my time killing bots. For upgrading, I generally start off with Charge and Mine, then Level 3 charge. After that I do my passive, then level 3 mine, then level 3 passive. I ignore the jetpack.
I use Gold: Rate of Fire Silver: Skill Regen Bronze: Reload (thinking of putting Armor or Health Regen) I mainly focus on using the grenade launcher and Charging people.
If you use the Gunners gun, which you should, you will notice that accuracy allows you to kill someone of the same class faster and from further away, this made my gunner a regular 30-10 ratio player.