As far as the stories themselves go, they’re pretty drab. The plot is predictable, dialogue is meh, characters (apart from 2) are more like caricatures than real people, the morals are as subtle as bludgeons, they drag on for no reason. I would not recommend them to anyone.
That’s not to say they’re not important books. They were and are influential. Today’s books might be better but they owe a debt of gratitude to the classics. So in some ways reading the Mahabharata today and complaining it isn’t great is similar to complaining that Seinfeld Isn’t Funny. Plus I will say, at least half a billion people love these stories and worship the characters as Gods. If that makes you curious, pick them up.