Yea entertainment is subjective, but how a game plays is what determines if it is a good game, glitches tie directly into that. Say your playing and this happens (http://www.youtube.com/watch?v=OZ7QR4t9K14), it will definitely hamper your experience.
Story is important but gameplay more so, that's why it is a game
@Sworder... Find the Tameem quote yourself, I'm sure someone saved it somewhere, I'll post videos of repeatable glitches if you want. :p
Official Pyro Jack of the SMT IV board. http://www.youtube.com/watch?v=Ypl2VWvjdn4&NR=1