Rank up being easy works both ways - I've gone from Gold 1 to Gold 4 on a string of losses this morning that frankly I can't seem to reverse. I'm sure being paired with Silvers against a near full stack of Platinums has nothing to do with it though lol. EDIT: String of losses has continued since the time of this post and I'm about to be knocked down to Silver 3 with one more loss so I guess I'll be contributing to the issue I raised in a way.
Role balancing is.... I dunno. I think that there's too much of everything going on and the fights are often far too intense to react and strategize around. The amount of crowd control, healing, and sheer damage all feels very high in group fights but in duels it feels next to impossible for anyone (skilled) to win without a five minute fight. The disparity between being zerged and not being able to react to dueling and both players literally being able to hold ground until the rest of the team arrives basically means that close matches are a rarity. You either wipe the floor or get turned into a mop to clean up your teammates.
Being able to look at a team comp and immediately know if you're going to win/lose should not be a thing. If I see any combination of Dragoon/Samurai/Summoner/Warrior/White Mage on the enemy team I immediately have an idea of how hard of a fight its going to be. Conversely, I have seen exactly ONE Gunbreaker all the way up to Series Level 24 - Black Mages and Bards are pushovers and I typically just ignore them until the heavy hitters are dead. Which, frankly, feels really bad to even admit.
The game mode is skill based in the sense of "How well can you coordinate targets" - apart from that there ain't much to it. If you're all attacking the same target you're going to win, hands down. And there isn't enough of a disparity between heavy hitting skills and low/mid-level potency skills to change that. I've had matches where I (as a Warrior) basically die faster than I can hit Guard/Recuperate and then the enemy team proceeds to do the exact same thing to each team mate in succession as if there was no cooldown on heavy hitting abilities. Therefore the winning strategy is: Bring good roles, hit Shift+M and put a marker on one player. Annnnd I don't enjoy that. I had more fun in Silver matches where people still didn't really have a good idea of that. At the very least I certainly spent a hell of a lot less time in the respawn screen.