If you wanted single target, the best damage:MP ratio skill is Siege Mode + X spam. It only gets better once Wind Sneaker gets Airelannanananalllilililania for machineshotgunarrowspam.
I'm not saying it's completely useless, but if you wanted a PvE set-up for Combat Ranger, I'd rather go Rail Stinger/Spinning Kick, Phoenix Strike/Crescent Kick, Magic Accelerator/Crescent Kick, and Siege Mode.
Also, magical skills aren't completely useless to Combat Rangers, even the Advanced Magic Passive can be used. Considering 10% or something of physical attack power goes to magical attack power with Power Fist-Pump Skill Icon-Thing, you can still make use of arrows and other magic attacks.