I got Frightful yesterday, and it ruled. Only bad part was the random fill in pages...
I loved Ellis/Immonen's Doom arc. It made UFF a guaranteed read for me, and introduced me to the greatness that is Immonen and goat legs. Then I read N-Zone. It wasn't as good (I don't really like the Kuberts), and Nihil was a crappy villain. Overall, Ellis' run was average, and more Sci-Fi than anything (which, in the case of UFF, is good).
But then I read Millar's run. Greg Land was doing the art. That was a great team up. When that was announced, I was enticed to pick up the first two TPBs, so it was because of this run that I picked up UFF. And I'm glad I did. These 12 issues have been one of the greatest runs of the UU. It's not Sci-Fi, but it's fantastic fun - which is what the Fantastic Four are all about.
And now, I leave you all with a quote that describes Millar's FF beautifully - "It's Mister Fantastic, not Mister Mediocre."