Incredibly rewarding, but understand that it's a 200 hour game
I'm writing from the perspective of someone who has played through Dragon Age: Origins and Dragon Age 2 multiple times, loves the novels, and even watched the anime and read the comics (which I didn't love as much, but that's another review). All of which is to say that I'm invested in the world and understand the politics and relationships that may feel like work for players new to the series who find the world-building to be attention-span taxing. I can offer advice to players new to the series, and I think the game is very accessible as a standalone, but my perspective is that of an existing fan.
And from that perspective, this game is in many ways a dream come true. I play DA for the quality of its characters and its narrative, and the major payoffs the game can create to those who put the time in to experience the world and the people in it. Somewhere in the 20-50 hour range is the first major emotional payoff, and hearing about the game from anyone who didn't make it that far is a bit like reading a book review from someone who looked at the cover and thumbed through the pages. The game is a commitment, but it's a huge world with wonderful characters, and it rewards anyone with the patience to explore and engage.
For the rest of you, try Crossy Road :-P