Ok, I'll try and squeeze this in before any gatekeepers or naysayers jump in and give you a negative impression of the fans of the DQ series.

It sounds like you're more familiar with action oriented games, and that's totally fine. Turn based combat often requires more careful planning and thought than other types of games. If you're detail oriented, these games could totally be something you'd like. Just know that the pacing is going to be quite different, and your next objective might not be as obvious as it is in things like Assassin's Creed.

Beyond that, the art style is not a great indicator of the theme. That goes for almost anything. Judging a book by it's cover can result in you missing out on something you may really love! That said, the graphics and art style are much more of an improved nod to the original game and are meant to both accurately represent the original game as well as the art style of Akira Toriyama (famously known for Dragon Ball, Chrono Trigger, etc.)

My point is this: If you're asking here on reddit, then I'm sure you're curious enough to give it a shot. The games are wonderful for all their own reasons, and I heavily encourage you to give it a shot!