I didn't read the Sequences (mostly, it must be said, because they were boring), enjoyed the first few chapters, didn't mind the insufferable tone, and just ignore the unsubtle preaching. I'm more bothered by That Major Story Event in the 90s chapters than his authorial quality, really.
What worries me most about that last arc is the possibility that we have to solve the plot before it turns into a sad ending. Eliezer has mentioned the possibility before, and even has done something similar before.
We may want to read HPMOR again before the last arc goes out, in the hope of gleaning that crucial piece of information that may save the plot.
