You dont need to max crit strike, the most % it adds is 55 I believe at level like 16 or something but remember you will probably have skill addons yes?
Multi is good but not really for cows I like Freezing Arrow better, also makes it A LOT easier to level your merc since you can freeze them and be doing great damage to them at the same time, they cant move thus cannot hit your merc.
Also with Freezing you wont need to max Dodge/Evade since they'll never make it to you but I still recommend putting some points into it.

Maybe tonight we'll fly so far away... We'll be lost before the dawn...