If a product meets your needs, is a fair price, and seems to be working fine after 30 days, you would not give it 5 stars?And then along comes the cable which, when I plug it in, causes a religious miracle to occur. How do I rate that one? Five stars is already taken. (Or maybe it should be two stars. I want to get my work done without being distracted by a prominent religious figure appearing next to my desk.)
To put it another way, when I purchase something I expect that it will work fine after 30 days and that it meets my needs. That doesn't warrant five stars. That's three stars: does what I expected, doesn't suck but doesn't stand out from the rest all that much. If it were half the price of cables of equal quality, then I'd give it five stars. But IMO the product has to be outstanding in some way to warrant five stars, otherwise why have a rating system at all?
OTOH, Amazon doesn't help with this. Click on "critical reviews" on Amazon, and three star reviews are listed. That's just broken. Three stars is middle of the road, not outstanding in anyway but not deficient, either.
So, no, given your parameters, I would not rate the item five stars. I realize the rest of the world doesn't agree with me, and I'm loathe to participate in such a skewed system (everyone gets a trophy). My concession is I'll give four stars to something I'd normally give three stars, just so it doesn't show up in the "critical review" section, broken as that might be.