Obviously if you don't enjoy it then that's 100% valid, but at least in terms of understanding what to do it's totally okay to play DRG without understanding anything beyond "shoot bugs and do whatever thing mission control most recently asked you to do". There's no need to play at a higher hazard if you don't yet know or just don't care to know about how to set up your weapons for maximum effectiveness or how to counter each type of bug and so on. Just play at whatever hazard you find fun and try things out until you find what you enjoy. There's no class or weapon that is non-functional without some other component. No wrong choices, so to speak. They're all just degrees of better and worse at any given job, and if you try something out on a mission and it doesn't work then the absolute worst possible penalty is just that you fail that mission and only get a little bit of xp and cash instead of a bigger amount.