What do you mean by ports?
What do you mean by unplayable?
Do you mean unenjoyable, dated, or simply not even working?
I don't know about ports, but there are several Kickstarter or "Early Access" type games that aren't ready and may never be.
"over a year old" goes back a long way too but I guess you mean recently.
Anyway, when it comes to buying a game you could look up customer feedback on STEAM as well as online reviews, as well as look up system recommendations for CPU/GPU etc so you shouldn't have much problem ensuring it works and can at least estimate how fun it will be for you.
Again, not sure of the POINT of this but there are several, inexpensive games (some over five-years-old) in various genres that are really fun and...