I mostly agree with what you've said. However I think the fact that previous HM's have been much easier, and that some have an expectation that they should be able to clear HM within a certain time frame is what is also causing people to be upset. The challenge was nice, even though the bugs were quite annoying. I think having HM be slightly more forgiving may appeal to more people in terms of keeping raiders in the game, since there is still the ability for nim to build on it. I guess it's just the time frame between HM and NiM which is boring when the HM tier is much easier.