I have less experience than most here, as getting together with my group is rare these days, but:
Likes:
1. 3 action economy - I agree with basically everyone on this.
2. Class feats - Being able to choose my progression is great, it makes archetypes work nicely and I am excited for the options it opens to developers.
3. Tighter math - I actually enjoy the evening out of the numbers quite a bit, though I understand why this is contentious. Proficiency system and +/- 10 system is rolled into this.
Dislikes:
1. Too many class locked feats - Especially combat styles. I feel like this is a big mistake, and an easy one to fix. I simply think they have gone a bit too far here, and they are cutting off too many options for players.
2. Magic weapon dice - As others have said, it seems too much like my weapon is the star here. I know pathfinder has and follows a tradition of strong magic items, but I prefer to feel like my character is the source of my strength more than his sword.
3. Healing - I think this is really more of a core problem than resonance, though I agree resonance has major issues. I didn't like the pile of wands of cure light wounds, but I also don't think v2 has a good system. Lots of interesting suggestions on the forum here. I like making the heal skill good, and/or having useful healing rituals.