In my experience, Squier necks across the board can be great, but the likelihood of getting a dud is higher than with a Fender. You can get ten Affinities and seven of them will probably be great, whereas you can get ten Fenders and nine of them will probably be great.
I've played a few Affinitys (Affinities?) and owned two. Most had halfway decent necks. A few were bad (mushy, unstable, wolfy). A few were quite good. Of the two I owned (both bought used), the neck of one was "meh" and the other was exceptional -- very nearly quarter-sawn, straight, stable, and strong. Acoustically, the instrument was solid. Fretwork was pretty decent, too. Pickups were neither very bad nor very good, but the bass played nicely off the bat.
I changed the electronics (pots, caps, wires, added some shielding), installed a Wilde P/J set, had the frets dressed, and put a set of GHS Precision Flats on it. Played great, sounded great. Ended up being a gift to a friend with more musicality than money and I considered myself well-repaid -- that little Squier ended up accompanying its new owner through music school and playing some gigs around Europe.
I don't know if there are different ranges within the Affinity line (this was a red P/J with a 20 fret neck and a white pickguard). And, to be fair, while I've played some Squiers with nice necks, this bass had far and away the best neck I've encountered on any Squier -- nicer than the neck on some American Fenders. Not as nice as the neck on my old Japanese Fender, but not terribly far off...
What was the question, again?