Don't ya get a big herd of monsters chasing after ya though or do you have enough movement speed to leave em in the dust? Sounds like a good plan.
You will typically leave them in the dust even with only +12% movement speed. I opt for the extra +10% for a total of 22% (Usain Bolt mode) using the "Fleet Footed" passive (Only use this if you can, killing speed/not dying is still priority #1). If there are some blocking you blind them or use serenity.
I think barbs can go up to +75% movement speed so they are even better for this type of farming run.
is there a list so you know what rares to pick up? trying to increase my efficiency farming
It is easier to create a black list of items you know not to pick up. iLvl63 after many runs you'll notice the names immediately. They are the "uber" items of the game right now. They have the potential to be worth 100 Million+ gold especially weapons.
For armor a good rule of thumb is iLvl60 or better pick up. All "Archon" armor is iLvl63 (i.e. Archon Crown, Archon Greeves, Archon Spaulders, etc.).
For weapons it is iLvl63 or bust. I also keep iLvl62 as there is a chance they can get respectable damage, but they won't be uber. iLvl61 and below is pure garbage as their base DPS is too low.
All other items like ammys, rings, follower, quivers - just pick them up. In Inferno most stuff will be iLvl60+ anyways.
Use the game guide to get the item levels of each type:
http://us.battle.net/d3/en/item/archon-crown
Not trolling, is this game worth playing yet?
The game is definitely worth playing. I love the interface and gameplay engine. You will have a good time with it and spend tons of hours playing it. There are definitely flaws in the game like group play, end game item and build diversity, but expect Blizzard to constantly improve the game over the next few months - it is in their best interests to do so.