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I think the FelG is awesome for solo/leveling purposes up till 70. If you respec make sure to have 3/3 Demonic Resilience and at least 1/3 Mana Feed.
Mana Feed is a waste to me.
When I got my felguard, I considered getting Mana Feed, until I figured out why its mana burned so fast. You have to enable/disable one of this abilites, depending on if you are soloing/questing or if you are doing battlegrounds.
While soloing, disabling Cleave saves loads of mana, and keeps from taking on too many targets at one time.
In the BG, disable Taunt and enable Cleave. The former has no effect during PVP, so you are just bleeding mana when that is enabled (same with voidwalker's Suffering and Tourment). When multiple PVP targets are Cleaved, there is not a distinct chance they are all going to go after you at once, because threat does not exist there.