I quite like it. Not everything can be The Wire and most people watching this are tuning in because they're fans of Simon's prior work. The thing is, those same people that like The Wire aren't into war movies so they'll be turned off a bit by the subject matter even if they absolutely love the writing (you have to admit, the dialogue is phenomenal). On the other end of the spectrum, everyone expecting some Band of Brothers, Saving Private Ryan kind of thing will absolutely detest this slow moving, few firefights series.
In essence, they've made a wonderfully solid miniseries that will disappoint absolutely everyone on various levels.