I think if you have a particular character concept in mind, you should opt for a point-buy or base array method so you can ensure you will get the ability scores that describe your character accurately.
While this is good advice, it's also a bit of question-begging. We're discussing what a low INT means in terms of how you play a character, not the best way to get an average or better INT score.
What if your
concept is a particular kind of stupid PC? I probably should have led w/this... or not, because I'm going to tell you about my (old) character!
(no hard feelings if you're out)
My 4e PC was Sir Yatagan Fracas, Paladin of the Dragon Within, poet, playwright, writer of "highly erotic labor propaganda", and stone-cold moron. High CHA, above-average WIS, 8 INT. This was my design. Heart of gold, head of tin. Or maybe clay.
I like playing talk-y PCs, so I have Yatagan as impressive verbals skills as I could muster; by turns formal, florid, and fanciful. He
sounded smart, until you listened carefully. Because I also gave him the reasoning power of a child. Or of an adult on a lot ketamine. His knowledge of history came from lurid historical romance paperbacks that survived the fall of the Dragonborn Empire. Everything he wrote sounded like pornography, because he didn't understand how mammalian reproduction worked (his people laid eggs). He was very impressionable, which led to him becoming a Communist (thanks to his red dwarf pal Lizzie).
He had no idea how anything worked, and no idea he had no idea. I would just open my mouth a let
words come out, in hopes they made a cut-rate
Jabberwocky-kind of sense. It was very liberating. I also hosted the game, so I could do this with the aid of bourbon.
Did I play an 8 INT accurately? I have no idea. Did I amuse the, ahem, poop out of myself & my friends? Absolutely.
(I think)