Druid- Swarm Monger druid: I have enjoyed this immensely, though at the same time its breakable with a little effort. But I love the alternate take on the druid, and insects has generally been a neglected focus.
Rogue- Eldrich Scoundrel: simply love adding magic to the class. It opens up SO MUCH, though I wish they would have been able to continue wearing armor.
Cleric- Cloistered Cleric. Everyone wants a cleric that is less "beatstick" and actually has some skills, but the sacrifice for gaining it was too much in its current incarnation. Would love to see it in an improved version.
Paladin-Grey Paladin: Another thematic idea gone poor mechanically. Love the idea of a less strict/morally grey paladin ( the code causes SO many issues, and is a leftover balance point from 2e, that is more hindrance than balance now)
Bard-Archeologist: This biggest draw of this archetype is its efficiency. Since you can only have one song, you generally only NEED one song, but you are given more than you ever use. THis archetype fit flavor and fluff to mechanics, providing a single all around useful benefit to yourself. Would like to see it have later improvements where it provides a smaller benefit to the group, though.