My personal guesstimate for WE's lemon rate is something like 30-40% for their older stuff, <20% for their more recent stuff. Definitely not the most reliable brand, though in countries where airsoft is legal, their very low prices more than make up for that problem. They're almost disposable in HK. In Canada, not so much.
"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."