I see a lot of people complaining about all of the various bugs and crashes, but next to nobody has actually provided crash logs. Without a crash log it becomes exponentially harder for the pack team or the mod authors involved to fix the issue. Nobody wants their mod(pack) to be unstable, however there are literally millions of interactions between all of the various mods. By sending the pack team your crash logs and bug reports you are actively helping to refine the pack. Once a bug becomes known it is generally easy to fix, and with each issue resolved the back becomes much more stable, and so do the mods included.
It's also important to consider that many of the authors behind the mods in the pack don't have the time or resources to thoroughly test every aspect of their mods, or how their mod may interact with other mods. Crash reports are invaluable to most mod developers, and can make the difference between a useless pile of code and your next favorite mod. Despite popular belief, most mod authors are grateful to receive crash reports and constructive feedback.