Lazenby, to his own admission wasn't an experienced actor. Depending on which telling of how he got cast in the roll, he basically sold the producers on his looks and a bogus resume. However, you got to give the guy an "A" for being able to pull that off.
Regardless, he's physical presence was great. Some of the best stunt work performed by any of the actors who portrayed bond; kudos to DC.
With a little more coaching and polish he might have wound up being regarded as a very good Bond. OHMSS stands out as one of the best films of its era, holds up much better than DAF. Although, Charles Gray's performance as a dopple ganged, drag queen Blofeld really takes the cake; "a bomb suprise".
A year or two prior to his death, Cubby Broccoli said of Lazenby, "George wasn't a bad fella at all".