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I didn't understand the phrase. What does "the plot is secondary because of the Krigan quest" mean? The Krigan quest is a very important part of the plot in M&M and Heroes.
What's not to understand here? Another same-old slaughter of Krigans is not good. It's a good thing that in Part 8, you don't have to mince poor demons with blasters. I know that Krigans are an integral part of the main plot of the M&M world, but surely a visit to them could have been implemented in some other way than just another invasion of their base with blasters in hand.