I'll add my two cents as well.
The Good
First, the class is entirely changed from the Stormblood build that it was. MCH in Stormblood was a total disaster, and I am happy they changed it entirely. They made MCH far more focused on its own identity rather than trying to copy Bard in most respects.
Another major plus, is that Wildfire is now no longer reliant on using your highest potency weaponskills and abilities to up its damage. It's now a flat gain per weaponskill executed during its cast. This makes optimizing Wildfire a lot more simple as a concept.
Furthermore, we were given new skills outside of Wildfire that have really high potency, making us less reliant on a singular skill for most of our DPS gain. Again, reiterating the point here: This is simply a strong follow up on making MCH more focused on its own identity, not just in theme but also in practice. So well done to Square Enix on that!
MCH as a whole became less about micromanagement as well, making the class easier to play. Priorities within the possible rotations are easy to understand.
The things that need to improve
The first thing which is the most simple problem that I'll cover is Ricochet and Gauss Round. Their potency seem very weak right now, and I don't feel hugely rewarded using these. It's more like a thing I could use between my typical 1-2-3 combo. It feels weak however, and should be buffed.
The other obvious problem is the Ricochet and Gauss Round timers. It sort of baffles me how easy it is to over-cap on these two abilities.
The fact that Heat Blast recovers fifteen seconds on each of these two abilities, per cast, is sort of questionable. Why is the time recovery so highly tuned? I feel this is the core problem regarding the complaints of playing the class with your own ping against the server. It ends up with us having to force a Ricochet and/or Gauss Round every time we use Wildfire and spam Heat Blast, all to avoid over-capping. This is where the clipping issue is.
The solution to me is relatively simple: Don't have Heat Blast give such an enormous recovery timer on Ricochet and Gauss Round. Then, to compensate for... quote-on-quote DPS loss for fewer Ricochets and Gauss Rounds, simply up their potency instead. This will in turn make it feel more rewarding to use outside of the Wildfire window.
As a whole, I am happy with how the class plays. My only major complaint is centered around Ricochet and Gauss Round and its respective timers, and perhaps potency across the board. Other than that, I'm very happy!