I have the other way around, always have high speech especially in FO1&2 and FNV, never got far with my low int guy though the dialogue was great. I have that waiting for my next run. But seriously speech is the most used skill in FO2, and Luck probably the most interesting ability.
Also, consider trying out Age of Decadence, it's designed so you can play through it only with civic skills and it has some great writing and a pretty interesting post-apocalyptic fallen Roman Empire setting. And it's only 1gb.