My guild's DK recently quit, and as such we lost our Melee/Ranged Haste buff. We do not have a Shaman either and I am the only hunter since we only do 10 man raids. Should I switch to Survival to give the raid this buff?
I feel like MM is akward now without that buff as I am so used to having it.
Yes. The general rule for 10s is if you have at least 2 melee and no Haste effect, then you play Survival for greater raid contribution. In 10s, MM without the 10% Haste is roughly equal to Surv anyways.
Note, still going to want to keep an MM spec handy for Beth'tilac heroic unless you have an awesome Moonkin.