Thanks to the initial EA issues, and now being caught up and beginning to level alt jobs, I've managed over 100 games of Feast and Frontlines combined...

I have played every job a handful of times, though some more than others. With that in mind, I rate the new system 6/10, with 10 being perfection. The OLD system I would have rated somewhat similar. Here are my pain points:

1) Melee feels clunky to play due to the still-poor positional updating and lost uptime during movement. The loss of personal CC made melee a bit more frustrating to play.
2) Clunky abilities are still in PvP, and they have no place here. Benediction, Hallowed Ground, etc. They need to be made more responsive since the mode is being shaped more towards reaction rather than pre-planning as it was previously.
3) Healing is awful. It's not as bad as it was back in OG Wolve's Den, but it is a massive step down from 3.2-3.5. I could go on for hours, but I will leave it at this: having a healer go from most impactful to least impactful role feels horrible. I will be doing a much larger and better though out feedback post on healing, but for now that's all. Expect to see very few healers in Feast.
4) Many jobs lost their identity: SMN is no longer an AOE king (since healers can no longer AOE heal). Many of the melee feel nearly identical to play, with their burst boiling down to "build up gauge, expend gauge to burst". Of course, there are a few outliers.
5) Warrior. Give it a stun.