Bow is not bad , i quite enjoy playing my ranger, but its very one skill spammy, mostly just double shot over and over.
So really its best to have full str to maximise the damage of that double shot so you can kill off a monster in 1-2 skills, as opposed to dex where you'll kill them off in 1-3 skills depending if you crit or not.
So over the course of time str would be faster and cost less mp.
Thats my own opinion though.
You can find plenty of discussions / arguments on the official forum over which is better between full dex and full str for rogues.
I guess in the end it comes down to personal taste.
This is a pretty decent guide , i would say follow this but go full str instead of full dex.
Luna Online Forum • View topic - [PvE Build] Easy and Effective Bow Rogue