I've read Countdown
, and by God is it awful. I'm specifically referring to the plot (or the entire lack thereof) and the characters (Nero is still a stupid villain that makes only the faintest sense). I could describe to you the entire comic in 1 paragraph, and you wouldn't miss a thing. Most of that paragraph would be the action set-pieces that are "just there" without much reason for them having happened. The art doesn't redeem much either, they made the Enterprise-E look like something out of Dr. Seuss on most panels.
...but at least they un-killed Data.