The real answer is YMMV.
I started CF(following the mainpage 3/1)at 5'11, 160 lbs coming from an endurance running background. I put on 5 solid pounds in just a few months, then stalled out a bit. I think the super high rep WOD's were driving me into the ground. I started to replace a workout here and there with a 5x5 workout. Within a few months I dropped the WOD entirely (extreme I know) and focused exclusively on Rippetoe's SS book (actually found and bought the book a couple of months before he joined the CF family - weird). No metcon's for about 6 mos, pure strength. I don't have a sport I compete in regularly so I felt it was OK to do this. I'm now at 180 and starting to work the normal CF-style workouts back into my routine. Overall it feels like it was the right thing to do, for me at least.