I myself make sure that the main stat for any character is at LEAST 17 or 18. I will accept low numbers; Dwarven fighters don't need good charisma scores with others to do the talking, and Orc fighters need not be charismatic or intelligent. My only character (2, actually) that I REALLY care about are the Thief and Cleric. The cleric starts as a fighter, and usually has a 17 Str, Wis and Con. Dex can be high but not necessary. He ususally has a shield (the Curved heater) thus gets a high AC anyway. The Thief is the main one. Must have a Cha of 17 or better, same for Dex and Int. Strength is usually high, and the character is always and elf. Other than that, the Fighters are always strong and healthy, and have good Dex as well (most use 2 handed weapons and need the dex for help with no shield). But having played D+D for so long, it is easy to know what works and doesn't.