As for whether DA:I was a good game, that is obviously subjective. I liked it quite a bit. The fact that it was a party-based game that still stuck with RTwP means automatically I will give it a high grade. Thank God we RTwP fans at least have that franchise still left for us.
Edit: And I'll even add further that DA4 is one of the games that I am very eagerly anticipating and looking forward to.
I also very much enjoyed DAI. So much that, just a short month or two after finishing my first playthrough, I did a second. It doesn't quite hold up to my nostalgic memories of DAO, but honestly it's hard for any game to do. DAI had good companions, fine story, relatively fun combat, sufficient dragon fights, lots of lore to read, and fun cameos of characters from DA1&2. Obviously too heavy on the collectathon, but that part of the game is optional.
I was very worried when I heard, way back when, that there were serious problems with DA4 and it was effectively cancelled in order to put developers on Anthem (ugh). But the recent promo materials and the news it's dropping multiplayer and live service aspects are excellent. Hopefully DA4 will be able to take the best parts of its previous entries and be even better than DAI.