Well...Gundam X had me interested the whole time. I know that's a bad way to begin a review, but please be patient, I'm making this using my vivid memories and poor structured writing.

Gundam X is easily one of the most underrated Gundam series, period. It is made really well, and the review I'm gonna be writing below this is hopefully gonna explain why do I think this way.
NOTE: Some of the things below may be considered spoilers. If you haven't watched X, then it's possible some of these parts will lower your joy when watching it. Those parts will be marked in spoiler text, but please make sure you saw X in its entirety before taking a look at this review - I'd hate for you to lose some fun thanks to this wall of text.
That being said, I'll try and structure the review somehow - the story and writing in general, art, audio quality and overall enjoyment. (I use the x.x numbering system - 5.5, for example. It's ideal for me.)

STORY AND WRITING: 8.5/10
The story in Gundam X is possibly the biggest grab it's trying to do. What if a war caused by humans ended up being so bad...that it will just take too long to recover from? X takes a look onto that, and the spin on a typical story of war is rather fresh and invirogating.
The story revolves around a group of Vultures captained by a man called Jamil Neate. While they seem like normal scavengers in the beginning,

Spoiler, click to view

their new task to protect Tiffa Adill brings them to rather shocking discoveries.

The adventures of the crew are actually written rather decently, alongside containing some issues that remain since the pre-war days. Especially things like the use of

Spoiler, click to view

Gundams, such as the Gundam X.

All characters have a sense of motivation. They know why they're doing the things they're doing. And that's what I like about an anime - characters committed to their role and have their reasons to do so. Even the villains have some reasons - although that's where I deduct some points. The villains are...poorly done, let's say. Their motivations are clear, albeit what they want to do is pretty typical and kind of..mundane. Although the way they get there is rather nice and shows what they're capable of.
The thing that the story needs the most is extra time - apparently it received poor reception in Japan and as such had to be rushed, and that makes me wonder what the viewers thought of this.

ART: 8/10
For the 90s that were riddled with strange art decisions, this looks really good! I like the detail on the mobile suits themselves in particular. The characters could use some detail, they seem a bit pasted at times, but I have absolutely no qualms about the art. And all of the important stuff - shots, beams and such look nice!

AUDIO: 8/10
Probably what stands out the most about X's audio are the intro and outro songs, which are energetic and feel a considerable bit more electric. The sounds feel clear a lot of the time but there's some hiccups every now and then when they feel like they've been recorded through two walls of concrete.

ENJOYMENT: 9/10
Overall I liked X a lot - the only issues I have are with the series in general are the villains and the fact Sunrise had to rush the end, which is a mighty shame.

In the end, X is an anime worth looking into. It shows the troubles of a ravaged world, skirmishes and conflicts that are brewing behind the scenes.