(I’m guessing this is supposed to be a joke in a similar vein as “Emacs is a great operating system that desperately needs a text editor”.)

You probably are looking for a different word, rather than “indifferent”. Indifference is a property of the observer/subject, not the observed/object. For example, if I don’t care about sports, I might say that I’m indifferent to the outcome of the game my friends are watching.

Perhaps “mediocre” is what you’re looking for?

See definition 2 here:

https://www.collinsdictionary.com/dictionary/english/indiffe...