I have a question

I've heard several people on this board make the comment that an album(ie TBF, ROR)is too ballad heavy or too pop. What do you base that judgement on? I'm not trying to instigate or antagonize. I honestly want to know. What qualifies a song as being "rock" and apposed to "pop"? What do you consider a ballad?
Going back and looking at the tracks of all the Journey albums I can't see a great deal of difference in the content of what I consider to be rock as opposed to ballad or pop except on Frontiers. Their music obviously matured over time. The songs on Infinity weren't as musically or lyrically complex as those on TBF, but the balance of rock to ballad, or what I consider as such, didn't change that much.
I was going to list, by album, the songs that I consider to be rock as opposed to ballad but that would make one of those tediously long posts. Can someone, or preferably some of you, give me some examples of the difference as you see it?
Going back and looking at the tracks of all the Journey albums I can't see a great deal of difference in the content of what I consider to be rock as opposed to ballad or pop except on Frontiers. Their music obviously matured over time. The songs on Infinity weren't as musically or lyrically complex as those on TBF, but the balance of rock to ballad, or what I consider as such, didn't change that much.
I was going to list, by album, the songs that I consider to be rock as opposed to ballad but that would make one of those tediously long posts. Can someone, or preferably some of you, give me some examples of the difference as you see it?