Recently, I've found myself not being able to finish my games. South Park, Shadow of Mordor, Sunset Overdrive, Watch Dogs, my most recent The Evil Within, and others. After I have my time with the game, I'll just all of a sudden stop playing it. I just don't have the drive to continue to play them.

I went back to Shadow of Mordor to beat so I can finally delete it to clear space off my hdd. After being away from the game, it's an extremely frustrating experience. I'm forcing myself to play and beat because I payed $60 for the game. I'm not going to waste my money by not completing it.

Does anyone go through this or have a similar issue?

I blame it on the games for being too repetitive. I have it mostly with RPGs, but the games you mentioned are really boring imo. Couldn't finish any of them either.
I feel like devs focus way too much on graphics instead of actual gameplay, but that might just be me...

You can just return them.

I don't think I can return digital games.

Oh! Didn't notice the HDD part before. I pretty much felt the same about AC4, which I downloaded.

 Sometimes I buy games that look mildly interesting or are being hyped just for the sake of buying them. Often it's those games that I struggle to finish.

Im toning down my game buying and finding that im finishing the ones I do buy and enjoying them more without the pressure of so many other incoming games.

Yea! Its quite annoying when that happens

I never do this. Out of the games you mentioned, Shadow of Mordor and Sunset Overdrive are fantastic, why wouldn't you enjoy them???

If the game is too repetitive then I stop. I stopped AC Unity because it felt grinding. I even stopped playing DA Inquisition for a few days to take rest.

It clearly means you aren't enjoying the game anymore. That is why I tend to shy away from paying $60 for games. Instead I research them a bit more so I have a better idea of whether I will enjoy them and them a physical copy on sale that I can always resell at a slight loss.