Although it does feel unfair, and sometimes the drops aren't as we would like them to be at times, I feel the new system is working okay. The percentage drop rate for a legendary item increases the more keys you buy, which sadly the last crates did not have. The pool was completely random no matter how many keys you have opened. Echoing off what wings said, there still is chance factor and sadly it just didn't happen this round and for that I am sorry :( I have had the same drop rate many times, but it is reassuring knowing that my chance for a legendary item increases as I go.