In my experience low to mid Op archers are fine - they go for bows with loads of different extra damage enchantments, they are very vulnerable to losing the bow though.

Grappling can be surprisingly effective low-mid Op - I saw a centaur character successfully grapple a black drgaon several times - every time the draogn then broke free, but it shut-down the dragon's ability to use full-round attacks on the party (very embarrassing for the DM).