Well, it's not primarily a combat game, at all, the auto-aim is good for this franchise since it's primarily focused on adventure, exploration, etc. which doesn't mean the combat is bad, it can get pretty exciting and difficult.
Don't let the first impression of the combat fool you even with what I said tho, you have to press the aim lock button to lock the enemies and, as this game makes you move a lot in combat and switch weapons constantly, it allows you to focus on actual fight strategy, I played Prime Remaster for first time when it came out and even tho I still prefer the 2D ones, it was a great surprise to me, specially the combat with aim lock, it felt very dynamic, fast and enjoyable.
Normal enemies tend to die quickly tho, they're padding in-between harder enemies and bosses, they also tend to be numerous and have you running around to avoid getting hit too much, that's my experience with MP1R at least.
The only thing I didn't like about the aim lock is that the button for it felt completely unnatural in some edge cases when you needed quickly swap weapons or combine them, but that's because it wasn't designed with twin sticks in mind, so I guess it's gonna be fixed in MP4.
The only thing I didn't like from the trailer is that, even tho it looks great, I don't like the extremely flat and smooth surfaces of the characters armor, I guess many love it but I have mixed feelings, preferring more detail, and it doesn't have to do with Switch capabilities, it's just an artistic choice.