S-RANK
Well, my preferred lazy weapon is the trusty Spur. There's nothing quite as satisfying as firing a giant laser. No level downs? Check. Major damage? Check. Last resort chance? Check.
Did you know? If you charge the laser and access the inventory screen to switch weapons, it will maintain its charge until you open the inventory screen and switch back.
Unfortunately using the switch weapon hotkey doesn't keep the charge... And opening up the inventory screen in battle kinda kills the mood. ("YOU WILL DIE!..... what are you doing" *reading Sue's letter*)
Blade lvl 3?! Under normal circumstances, it's unwieldy and slow. But, theoretically... It makes the most wonderful fire and forget support weapon. So if you have a way to shoot it and instantly switch back to your primary weapon you're outputting more damage! Somewhat manageable to do if you just have 2 weapons...
Super Missile Launcher. The great boss finisher. What more needs to be said? Sadly, with the limited ammo, I think few get to enjoy the satisfaction of fireworks on normal enemies...
Machinegun lvl 3. It's got mobility and a guilty little secret. If you tap the fire button as fast as possible... you fire faster, AND you use less ammo. (A rapidfire key... really, really comes in handy in saving your arm.) Doesn't quite output the damage as other choices, but what a solid choice.
A-RANK
I know what you're thinking... Bubbler lvl 3??? Actually, I love when mods give me the Bubbler early on. Bubbler lvl 3 might be stronger than a lvl 3 Machinegun if I recall correctly. The trick, like the machinegun, is that it can fire much faster and nearly forever if manually tapped fast as possible. Bypassing most energy consumption.
My greatest disappointment however... Are that bubbles automatically turn to lightning after a sec, when attack is held down. ... Because if you hold down the key and switch weapons, the bubbles stay. So if they were modded to last longer, or not attack until switched back to the weapon... It would make a most interesting support barrier.
B-RANK
Fireball... That vertical bounce! Also, makes for a reasonable fire and forget weapon. Imagine if Quote could dual wield... Well you could spam switch weapon...
F-RANK
Nemesis lvl 3. What a quack! I wish it went all the way and just healed the target honestly...
Or... perhaps it could have mod potential. Don't want to kill an NPC? Stun it! i.e. Cave Story would be pretty oddly dark and depressing if Toroko explodes at the beginning. I mean using that lvl 3 polar star on little Toroko seems a little dangerous, am I right?? ... huh? I'm the only one who grinded to try that at the start? D: