Well you need to put one point in all three in order to get a Valk. Past that, it is really open to debate about how useful these skills are. What matters is your play style and build. If you put points into the dodge skills you will be subject to the Fend bug, meaning if you go into a dodge animation during an attack cycle the rest that cycle you will 'whiff' or miss. This effects jab, fend (duh), strafe, even zeal if you use a 'passion' RW weapon.
Because of jab's rapid attack speed, the bug really isn't very noticable. The same with strafe, plus there are other things impacting strafe like AR and next delay, so it really isn't any big deal there. Fend is another story. It really mess's you up, particularly if you use a big slow spear.
FA,LF, Multi etc. are not effected by the bug. The only build that really utilizes big dodges is the Tankazon. (normal attack)
Good foot speed is the best dodge skill of all, zons should never walk.:wink3: