You're right. The folks moaning about it being pure chance don't have a strategy. I got the "-ATCH" after the 3rd guess. And it's obvious to any idiot that there are too many words that end with those 4 letters and my next word was "PUBIC". That eliminates PATCH, BATCH and CATCH.
The guys who claims it's pure chance, you do use some sort of strategy, don't you? How'd you feel if someone whose only strategy was to always use the same set of six 5 letter words, never used the results of the previous word in the next one and kept crying that you were cheating or it was pure chance?