I only read the last few chapters of the manga, but didn't read the final one. From what I've heard, it follows the manga pretty well, but the anime skipped an Ishbal arc (a flashback, I guess) and shortened it due to time constraints.
The anime also changed some minor details, but overall it follows the manga close enough.
I dunno man DA feels like there's just as much grinding as jrpgs if not more. It's a different kind of grind though. 90 percent of the game feels like grinding stupid quests and grinding through dialogue.
Also there's new armor/weapons/items introduced every second and it feels like 90 percent of the stuff is probably unnecessary. I feel like they just add a lot of junk in to make it seem like the game is more customizable than it actually is. It's so annoying to have to walk back to town and sell all the junk that drops constantly from mobs because I don't have enough inventory space.