I've never seen The Room so my opinion may change if I ever do, but there is another movie that I have seen (though only by proxy of MST3K) called Manos: The Hands of Fate that also has been referred to as the worst movie ever made, and I wholeheartedly agree.
Not sure why I chose to watch that but I have to agree, that's comparable to The Room (if not as funny on it's own like The Room is, absent the jokes added by the MST3K hosts this one would be getting fast-forwarded constantly).
Things that are "bad" like that are uniquely bad. It's not just annoying or purposefully bad, it's a side effect of a series of poor judgements that make it amusing.
The most revealing part was in a Youtube comment that explained the master's helper guy (who takes up a ton of screen time) was clearly on acid the whole time, which makes his totally unusual behaviours understandable for anyone who has tried that before. But still very very socially awkward and creepy.
https://en.wikipedia.org/wiki/Manos:_The_Hands_of_Fate