Ruprick the difference lies only in the amount of competition. At a state university (or 4 year university...really ivy leagues and state schools are the same in terms of the sciences...I am sure I will hear about that) there are many more people in a class that you have to compete with and usually they are more qualified than most of the people in the class at a CC. Personally, I found the content, teachers, and quality to be the same. I think it has to do more with the fact that it is a smaller class size and more conducive to "learning your professor" (ie their tendencies on a test, what types of questions they like to ask, etc) as opposed to a 4 year university where you can get lost in the shuffle and have no clue how to predict what a professor will throw at you (hence the survival of the fittest: those who can adapt much better end up as the top notch students and earn As). I know on some of these points I am generalizing here...but you get what I am saying...same classes, same teachers, same quality, same grading...but you compete against students who you couldnt compete with at a 4 year institution.
What I am saying is at a CC you can be the top dog and end up at a 4 year university and be middle of the pack. Its really just the level of competition and nothing else. I also think small, private universities are similar to CCs for the same reasons and because there are so few people in your class, competition usually isnt as fierce as it is in courses with many people.
With that said do adcoms really care where you went to school?
No (ok some do....1 school out of 8 I have visited/interviewed at told me they take where you went to school into consideration). Grades and DAT matter...why your GPA is high is of no concern to them (as long as you graduated within 4-5 years and your courseloads were fairly significant)