I recently watched NBA and heard the commentator say “It’s so fun watching players evolve.”
Is it common to use “fun” as an adjective this way? I’ve always believed that “fun” is only a noun and that “It’s so much fun” is much more commonly heard. The dictionaries say “fun” can be an adjective; if so, “it’s so fun” or “it’s very fun” should be grammatically fine, but they just sound weird to me.