As somebody who enjoys all 3 games immensely, you don't strictly have to play Miles Morales. You'll be missing some of his character growth that continues throughout 2, but a lot of the broad strokes you can pick up from context.

That said, I highly recommend playing Miles Morales.

I haven't done 100% on any of those, I burned out on them around the 90% mark. All three games are great, you should play them.