Yes! Of course you should buy it! of course u should complete it!
It's an amazing game sequel to the old god of wars, don't worry though. If you haven't played the old ones it will still be a super enjoyable game since if u listen and read you'll know the history before without any problems.
I have completed it on the ps4. And on pc, it's a different, much better experience imo.
Highest rank!

Also, trying to complete on the hardest difficulity this time! Adrenaline pumps, it rocks! U gotta think what u do and always be aware.