Well, at least there's an UA article with feats. I wouldn't say there's universal acclaim that they are nice - I really dislike some of them and mildly dislike the rest.
For the weapon feats I really don't like the power creep of +1 to hit, the further lock-in to specific weapons to a character so I must tailor magic weapons to specifics, the extra time at the table some require like "did both dice of advantage hit?" or "would the discarded die of disadvantage have hit?".
Some of the non-weapon ones were okay, but gave out abilities that you should be able to work out with checks but now it's sort of codified you need a feat. "Can I taste a small bite fo the food and tell if it seems off?" shouldn't be responded with "Do you have the Gourmand feat?". And the one the doubled thieves' tools seemed like it had the potential to turn into a feat tax - if one character with proficiency gets it and the DM recalibrates DCs, then all of he characters with thieves' tools proficiency need it.