You don't play certain characters that much.
Mike and Sam hog up the game so much that the other characters didn't get to shine. If I had to rank the playthrough parts for each character in terms of length(assuming everyone lives to the end), it'll go something like this.
1. Mike
2. Sam
3. Chris
4. Ashley
5. Emily
6. Matt
7. Josh
8. Jessica
Mike and Sam anchor the game. Chris and Ashley had good balance of playthrough with Emily following. Matt disappears halfway into the game. Josh is barely playable and doesn't happen until late in the game. And Jessica was pathetic. Only thing I remember from her was playing snowball fights with Mike. And the whole scene was just a QTE.