people just wanna hear more and more talent, talent encompasses more than just technicallity complex.
every instrument requires different things to measure talent, and then there's song structure, composition, arrangement, lyrics, etc.
beyond that it is what the listener weighs more. for example someone may focus more on the lyrics of a song than the melody and composition of the song. this is where musical taste comes into play.
i think every band out there has some talent in some area, otherwise they wouldn't be out there or liked at all. the problem is, is when you have bands that can do the same or similar things 100 times better (showing more talent in different areas than just one). this is how you can tell if a band sucks (used in the comparative sense) or not.
beyond the CD and the music, sometimes it is the live show that captivates people. the band displays alot of energy on stage that grabs the fans. they may play two chords and sing about the same shit over and over again, but wow they are able to go crazy.
anyone whose played live understand that no matter how simple the music is, it is pretty hard to go crazy on stage. it takes guts and you gotta know what your doing.