James Harden's Unopened Houston Restaurant Gets 1-Star Reviews From Angry Fans

James Harden's new upscale restaurant in Houston isn't even open yet, but the place is getting flooded with bad reviews ... courtesy of a bunch of pissed-off Rockets fans!!

Despite being shipped to the Brooklyn Nets this week, Harden's restaurant -- named "Thirteen" after his jersey number -- is set to open its doors later this month.

A number of passionate fans used the restaurant's review section as an opportunity to troll the hell out of their new nemesis ... leaving a bunch of angry 1-star reviews of the place.

Here are a few examples of the reviews:

"Literal trash just like James harden"

"Owner doesn’t know how to cook it up in the court."

"Doesn't quite have that championship taste."

"toxic owner, food just never comes out finished. definitely a choking hazard. owner walked out on the chefs he brought in himself. wouldn’t touch this place with a 4 mile long pole."

One fan even used the same words from Harden's final post-game presser with the Rockets ... saying, "I literally have done everything that I can. I mean, this situation is crazy. It's something that I don't think can be fixed"

There are a LOT more we could share ... but you get the point.

Some fans, however, are taking the higher road by trying to combat the bad reviews with 5 stars and kindness, like this guy who said, "The owner carried my team for 8 years and made us relevant."

The new spot will offer fine wine, cocktails and steaks ... so folks can at least enjoy that even if Harden is gone.