Just got done reading the issue of the X-Files/Transformers Crossover.
So if you haven't read it yet - WARNING! SPOILERS!!!
First off, as part of an ongoing series (issue 4 of 6), the X-Files side of the story is not simply contained within this comic, but however the comic is readable on it's own. You do get a short blurb about what's come before.
Only the 3 Transformers are shown: Optimus, Bumblebee and Ratchet. The weird thing is, it seems to be G1 Optimus, IDW Bumblebee and Prime Ratchet. Very odd, you think they would have picked one genre and stuck with it. Ratchet in particular looked very out of place. Also the humans seem to get mildly surprised when they meet the Transformers, but get over it very quickly and don't actually seem that interested in the fact they are giant alien robots from outer space. You think for 'Mulder-wannabes' they would be a bit more curious
A plus for me was that mid-story Bumblebee scanned a military vehicle and changed his alt mode in order to infiltrate a base. This is a power of the Transformers that we see used to the full extent very rarely. Sorta reminiscent of the first live action flick. What was kinda shocking was that Bumblebee totally massacres a bunch of paramilitary types to save his new human friends - sure he is killing bad humans, but he is still killing humans (not that I have a real problem with that - just seems out of character).
The artwork is... okay, considering the genre it is a crossover with it seems to be appropriate. The storyline is fine though not riveting, but ties into the other X-files comics and there is a brief reference to the previous TF Infestation comics. All in all I'd say pick it up this issue for it's novelty value.