Like in Anime's, the OP is Opening, the opening theme.
Nothing will change now, but they did screw a great OP, left it in the closet instead of using it all the time, or so.
Crash (US) in S01 HDTV used the complete long OP but now on S02, it's only 3 secs showing the logo, and The Middle, it's the same thing just show's for some secs.
LOL, they could've done a proper OP/Intro for The Middle, as it's a MITM's copy it deserves to have a good/great OP.