compared to other pools the reject rate on wafflepool is usually lower less than 4% on my setup
Reject rate over a short time isn't useful, and overall the pool averages ~3%. Varies a huge amount though, some 1-5min periods are 0%, some are 20%, the difference is, when you're mining a coin at 20% stale rate, we expect a huge profit from those coins (making the 20% worth it). This is expected, and accounted for in the switcher.
I am talking on average over the day in the last 11 hrs 15 mins it's been 3.48 % or or 417 of 11985 which is good compared to the likes of clevermining