A Gundam show thats something else entirely wearing a Gundam skin. Very little besides a mix of 'member berries and Anno nonsense.

Full spoilers below.

A story that tries to tell too much in too little time and what it does say is boring at best and incoherent at worst where things just happen with little reasoning behind it. Does this show wish to be a show about two young women fighting in illegal Gundam battles? Does this show wish to be a What If? scenario asking what if Zeon won the One Year War? Does this show wish to be a show about the interaction between alternative universes? It tries to be all these and more with only 12 episodes leaving little to no room for anything to breathe at all. Are we supposed to care about the Clan Battles crew? After the first arc they disappear entirely with little time to even remember their names yet. Are we supposed to care about the inner strife and tensions in this new Zeon Empire? The other plots barely lets it settle in your mind by the time the Zeon Civil War breaks out. There is no time for anything. A plot by Federation forces to assassinate Kycilia with Gundam returnees Bask, Gates, and a new Cyber Newtype character named Deux is introduced at the end of one episode and this entire subplot is then wrapped up and over by the midway point of the next. Deux is introduced and then killed in less time than it takes to make a sandwich. You get no time to even care about any of this before it's even over. Later on there is a subplot about a Zeon double agent secretly poisoning his juniors only for it to be resolved from start to finish in half and episode. Nothing lasts long enough for the viewer to grow any interest or attachment to what's even going on.

Another major aspect of this show is ultimately "Remember this person/place/thing you've seen before?" Remember Bask? Remember the Psycho Gundam? Remember the Solar System? etc. Don't get me wrong, such things have their place and are important in stories set in the same universe as the other referenced media but GQuuuuuuX's all feel hollow as can be. What even was the point of half of it? This ties into the whole multiverse aspect this show has that makes little in the way of sense. If this was going to be the major hidden plot why is it so sudden and only relevant to the final 3 or so episodes? Why is literally NOTHING in this show explained? Why can the Gundams communicate with their pilots now? Despite things like the Psycommu and Psycho-Frame being existing technologies in prior UC Gundam works such a thing as this has never existed. Nor is this ever explained. This is true for so many things in this show. Why did GQuuuuuuX sprout out mini black holes that seemingly could do whatever the plot demanded at the time? Why did the original design RX-78-2 grow to the size of a mountain out of nowhere? Things just HAPPEN and nothing is ever explained and it's over leaving you little time to properly process what is even happening. If the multiverse is such an important aspect of this show's plot then this begs the question...why is this given so little time with such little proper explanation? Why is Shuji the key of this all? Who even IS Shuji? At no point is this ever explored. Hell, why Shuji at all and not Amuro? If the major point of divergence for all these universes is that fateful battle of Amuro, Char, Lalah, and Sayla...where the hell is Amuro and Sayla? Sayla is barely relevant to the show at all until the end. Why is Shuji both the pilot of the RX-78 and not Amuro? Amuro's voice is used for like two sentences as a disembodied voice seemingly coming from the Gundam itself but...why? How? What does this even mean? Things just happen.

Really, take away the 'member berries and returning Gundam iconography and look only at what GQuuuuuuX itself does and what are you left with? A rather shallow story with characters that are not given enough time to be fleshed out in a story that doesn't do much exciting or original and ends in a multiverse mess that isn't that deep or even explained. None of it feels like a proper Gundam entry and results in a story thats rather Gundam in name only. At the end of Episode 11 they even use Beyond the Time as the ending theme and the only thing I could think of was "This show does not deserve to use this as it's ED. It did not earn it." I will say I did enjoy some things like some of the character designs and I enjoyed some of the OST but thats little in the overall show. An okay ride if you turn your brain off but not much more.

TL;DR:

Pros:
Some neat ideas at least.
I kinda liked the OST.
Machu feet.

Cons:
Story and writing made little sense and weren't that enticing even when it did.
While some of it's ideas could have been neat it's execution of all it's ideas was poor.
Not nearly enough time to invest in...anything at all.
Felt like a bowl of 'member berries and Anno shitzo nonsense mixed together.
Removing the Gundam fanservice and leaving only the original stuff reveals a story that doesn't feel much like Gundam.
Why Shuji?
How Shuji?
What Shuji?