Overall I liked The Peacekeeper Wars, but naturally I had a few quibbles. First, I didn't care for the sometimes-radical makeovers the characters underwent. Sure, partly the actors don't look quite the same as they did a couple years ago before the series was cancelled. But there's no explaination for why Sikosu has completely changed colors! It's supposedly only been 60 days! They offer no explaination at all.
It's also apparent that Lani Tupu was a little out of practice at doing Pilot's voice. While that's understandable, as two years have elapsed, it was still a shame that Pilot basically sounded like Crace- he never used to.
I didn't think killing off a major character and one minor one was really all that "cool." It smacked more of a cheap way to inject some drama, IMO. It didn't advance the story a bit. Although it probably does help them fend off fan pleas to resurrect the series- given the way The Peacekeeper Wars ended, there's really no way to do so.
My main complaint is that the pacing is too rushed. That's understandable given the circumstances. The last regular episode, "Bad Timing," was meant to be a cliffhanger ending to the 4th season, and the crew had every expectation that they were coming back for a 5th. They opted not to do a frantic rewrite, which of course meant a better episode but an awful way to let a series die. The Peacekeeper Wars then has to compress the entire intended 5th season into four hours. That's hard to do.
Still, minor quibbles aside, the microseries turned out great. The effects are absolutely stunning for network TV, and the acting & writing are top-notch, just as you've come to expect from Farscape. Given the nature of science fiction, I guess you've always got an out if you want to create a new series and bring back the dead characters (the characters that were are important enough IMO that the series wouldn't be viable unless they were brought back somehow. Or at least one of them).
Overall, a fitting end to one of the best series ever aired.