If you roll you can go as low as 3. But the game doesent allow that 🤷♂️
An int of 8 is indeed quite stupid. A stat of 10 is considered avarage. And if you are more stupid then a commoner who might not even be literate thats saying something...
I thought the phb says 8 is average human intelligence. So 10 would be higher then average if so.
I do agree as a whole, I would like to do some crazy builds with stats below 8 though.