Arrow shower is the best skill archer has. It's like making spike as thurst. 5+1 gives exactly same damage as 3+3 (both 6 arrows in two skills), but during pk you might use 5 arrows once in a while when you got occasion. Always you can give a try with minnor arrow shower combo. Pretty balanced. 3+3 is pure stupid. Who would like to play archer then with no way to win vs.
More to it, i played on a server where 3 arrows skill were decreased to 1. It kept archers from becoming OP class. Worked well.