Been playing on and off since launch, and I have two points to declare here out of MANY.
1. The loot system.
It's winner take all. Really no fun to do a whole FP or OP to basically get nothing. paying a subscription to wait next week for maybe a chance and if some guild officer decides I can have it (no likely). Since you are not running public groups on HM DF/DP and are basically now obligated to join a guild to maybe get loot? I think DDO had a better system.
2. All or nothing missions
Going back to ops, recently had a situation where 16 SM DF and it was all fine. most of the op was one specif guild and we just filled in roles. Get too the last boss fight and after 1 wipe he tells people to leave and go do it in another group. when I point out the fact that people who couldn't do it before won't be able to do it then he just kicks all non guild members and what can I do? nothing but be locked to the last boss and receive nothing for my effort.
In summary, still not worth the subscription.