Welcome to the forum, Oilers do indeed rock!
I'll probably repeat a bunch of what has been said already...but oh well.
#1: Yes, too much room above while missing stuff below. It's a bad habit to fall into. Your 7D has a great AF system, so you don't have to use the centre AF points all the time.
#2: No bad. I'd crop this one right in. The only good/important parts are her & his faces...the rest is just useless space.
#3: Not sure where you're going with this one. Looks like a snapshot between poses or something. The horizon is in the middle, which feel bland.
#4: The grass is nicer but the sky looks pink.
#5: Cropped to close to the groom. Kids heads are stacked. When posing a group, think of triangles, not lines. In other words, never have someone's face right above another when you can have them staggered. Also, there is a lot of space between the 'groups'. Try to space out the people in a group photo, so that their faces create a nice composition within the frame. I'm sure it was easier said than done, as the kids were probably running around, acting like kids. It's a tough racquet being a wedding photographer
#6: Nice pose, cropped too tight. Also, as with some of the others...the sky is just too bright. It's a tough situation because if you expose for the sky, everything else gets too dark. In this situation, I would still try to expose for the sky, even underexpose it to make it look dramatic...but then use flash to light up the subjects. I would probably require a lot of flash power though.
#7: Sky looks much better here. I'm not sure if you shot it that way, or just edited it that way. The groom is too dark, the dress is too bright (and blue). Like I said, wedding photography isn't easy.
#8: Nice fun shot (did you think of that?). But it's cropped a bit too tight and the angle could have been better or more creative. I'd like to be able to seek the bride's face (with proper exposure) in the shot.
#9: Best shot of the bunch...by far. Not only did you expose for the great sky...but you lit them up really well...
with off camera lighting. You should have been shooting like this for all the shots. :thumbsup:
#10: These are always nice. I might have tried to get a bit higher, to include more of the colorful sky...rather than the dark clouds. Could also try this one in a vertical and/or cropped closer.