You all saw the response to the seventh issue, and honestly you pretty much should just read my review of that issue. This one will end up pretty much the same. But with more 70's. Or at least, this issue was basically the same as that one but in the 70's. Scott Koblish's artwork manages to do an amazing job at capturing the retro vibe without loking truly outdated.
And basically, this issue is so extremely insanely over-the-top fun. It's hilarious, entertaining, everything. There's brilliant continuity nods, time period jokes, and all sorts of blaxploitation cliches.
In Conclusion: 5/5
I hope every arc is followed by a flashback issue side-story like this as long as Posehn and Duggan are writing this series. The main arcs have been getting more series, but with Deadpool, it's nice to break it up with some gut-busting comedy.