Which codex are you using? Most of the PDFs floating around are out of date, this is the 7e codex in its current form:
http://1d4chan.org/wiki/Codex_-_Angry_Marines
The point values have been brought up to date with codex Space Marines, but no formations.
I've never played them in a game, but I can tell you that the current Codex isn't at the same power level as
SM,
DA, and the other 7.5 armies.