Out of the games I have played, LEGO City Undercover. It is an alright game, but I got to the end and have no desire to finish it. Only played co op with my stepson, and we have since moved on to Fire Emblem Warriors (which is great if you like that playstyle btw).
If I am picking games that were first released in 2017 though, I would have to go with ARMs. Dont get me wrong, I love the game and will return to it eventually. It is just my least favorite 2017 release that I invested in.
I think I can say though that I have not really bought what I would conside a bad game this year, so it is hard to call. I did play the mobile version of Lineage 2 however, which is way too automated to be considered a good game IMO. It is free to play though and I did not buy micro transactions, do that doesn't count. =P