Are all classes useless solo except Wing Diver?

Hi all!

I started playing EDF5 a couple of days ago and played through the first 35+ levels with Wing Diver. I have found a couple of really good weapon setups that allow me to annihilate almost everything within reasonable time and usually at first try.

Even though I absolutely enjoy this class, I wanted to try something else for a change.

However, I found that I'm totally unable to successfully play any other class. I either die, or the fights go terribly slowly so I just get bored.

I really wanted to get into Air Raider since it seems really unique, but I'm struggling to find a good tactic for him.

Should I replay the first levels with him so I farm some better weapons and only then try to tackle next levels in order, or am I doing something wrong? Any recommendations for solo play in terms of weapon setup?