I've seen some pretty decent Battlegrangers in my day, and used to be one.
On lagged, you can just circlestrafe and spit on them and occasionally move in for a bite.
Unlagged makes this much harder, but can still be managed.
Grangers can actually be ideal for surfing turrets if you're low on evos.
With one granger, and some luck, you can get about three rets in an unattended base.
Most of this means nothing because if you're really considering this for a public game, you're a silly feeder noob who needs a good !denybuild.
Unless you're me.
Which it is.