This question is always a slippery slope.
1) There is no average weight loss post-op, some people even gain.
2) There are too many variables: starting weight, sex, health status, whether you had a pre-op diet or not, and age just to name a few. DON'T COMPARE
3) People lose at different rates. Some are slow and steady, some are fast out the gate and eventually slow down to 6 - 12 lbs a month.
4) Inevitably someone will read this and feel crappy about their own weight loss leading to a plethora of "I only loss..., what's wrong with me" post.