I found engineers VERY helpful on the Maximillion fight. They can restock lancer's ammo just by running past them. Plus I don't know how many times they've saved my ass in tank fights, healing the Eidelweiss. I love me some engineers.
Eidelweiss I also find extremely useful in certain contexts. Such at breaking up enemy camps. 3 or four guys hiding behind sandbags? Use a mortar, destroys all of their cover and will either kill all of them or seriously injure them all. Obviously using it to kill 1 guy, or just a light tank is going to be overkill and a waste of AP. But in the right situation it's indispensable.
Every class is extremely useful, you just have to know the context in which to use them.
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