Can't get used to curving with the stick to be honest. It's not intuitive at all (for me) so in the heat of battle I don't aim properly.
Some ARMS are definitely easier to start with with less aiming required. Like Spring Man's Triblast and Boomerang. Triblast covers front/back and Boomerang covers left/right and they both curve prior to punch and cover good amount of area so you don't have to be as precise.
Using the boxing glove arms like Toaster that gives you a lot more precision all the way through is definitely a lot harder to start with.