>>718457794 (OP)
More of the same but better, mostly. You get new ridiculously elaborate gimmicks like the Navi Customizer, a tool you can use to give Mega passive buffs. There's more chip variety with new gimmicks and interactions. If you liked how the second game played, you will guaranteed like the third.
>>718457794 (OP)
Agony with the fucking press program, a couple others but press is the main recurring annoyance. Apart from that its a straight upgrade from BN2 though could argue BN2 style system was better than 3