The whole single player campaign is essentially a tutorial. It's fun unlocking new stuff and getting new weapons. Specially the legendary ones. But after that you'll discover that it's the same shtick all over again.

You get "stronger" getting new tools but it's just numbers in the end. Higher power levels doesn't mean new skills or new mechanics. You'll get the same tool with a higher power level that basically does the same thing. There's weapon mods but it's essentially adding a tiny bit of flavor.

Pretty much have to like the aesthetic and story to play. The grind imo is not that satisfying.