IMO the game mechanics fit fairly nicely. By the time he has that +6 to hit with his bow (I'm assuming a high dex, weapon focus, archery feats, etc.) then you need to match his level with the encounters. If he is 4th or 5th level, then adjust the encounters accordingly. Without all of those bonuses, which afterall, are just numbers in a number crunching game, that character and the party would never be able to get past orc, goblin, and kobold encounters. You can't compare this edition's game mechanics with those of earlier editions either.