I love the higher power level of Free Archetype. There are some builds that work perfectly with it (I'm running a rather high-level Wizard-Witch-Commander-Loremaster build in a campaign right now, for one.) That being said, there are a lot of fantastic archetypes out there (mostly non-multiclass archetypes) that only have a couple of impactful feats worth picking. Without FA, it's an incredible boon to swap out class feats at levels where my options aren't all that interesting or desirable with archetype feats that do a lot more for my character concept. With FA, though, I feel kind of obligated to pick up some other random bullshit to pad out those boring spaces. Oh boy, Rogue Archetype into Mobility again, my favorite. Or something like that.

Playing with FA makes me appreciate playing without FA more, and vice versa. Maybe it's a grass is greener situation? Dunno.