This attached garage was added to a ranch on a slab. Appeared to have been converted from a carport. There are several issues (firewall, dryer and bath venting into the garage) but my confusion is the gravel floor. It just doesn’t seem right when attached to the house. I have identified it as unfinished. But is there anything wrong with a gravel floor in an attached garage. I haven’t run into this before.
Not really. If the new owner wants to pour concrete, they will have to excavate some of the gravel out first obviously.
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I agree with Ryan, not a problem, except it’ll be harder to clean. 
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Nobody likes oil stains on concrete. Its genius.
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Looks like the gypboard mighy be installed under the OSB.
Nothing wrong with gravel floor unless required by local codes.
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NOPE.
As others have mentioned it’s a non issue.
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I am in agreement with everyone above.
Write up fire/fume rating issues.
I would include, missing a flat rigid garage door saddle, to prevent air/weather leaks and damaging the bottom of the garage door, the astragal. But that’s just me.
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You can’t seal a garage door to a gravel base. The car will rut out where the wheels are after a few passes in and out.
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My exact sentiment. You can’t seal a garage door to a gravel base.
Recommend a poured concrete garage door saddle.
Agree, no issue.
Even when a garage has a nice slab, it’s a seperate from the home’s foundation.