Time was Ida put my fightin' boots on but I've mellowed and I realize these days it's down to personal taste, the one point I'd like to make is I think that the importance of Punk is over-rated, many of the bands associated with it were muzos hitching a temporary ride The Clash (I remember the tears spilt when they signed to CBS)/The Stranglers, not really punk at all The Jam, Elvis Costello, wannabe popstars like Adam & The Ants & Billy Idol/Gen X or pretty mediocre X Ray Spex and Jilted John (first played on John Peel's show, so no revisionism).
I enjoyed some of the cartoon heroes like The (sic) Pistols who coulda been contenders if they hadn't been so easily manipulated by their manager MM & The Ramones. Across the pond the scene was different the NY bands like Patti Smith & Talking Heads coming from a completely different musical source. I suppose the biggest contribution Punk made was to kick the doors down and make releasing music easier for subsequent non-punk artists (2 Tone) but I remember 1977 and musically the angriest album of the year remains Animals by Pink Floyd - the truest punks of all.
The reason punk rock seems so influential is that it's a catch all for most of the new bands from 76-78, even Tom Petty & The Heartbreakers were lumped in by some folk....
What connects TP&TH with Ultravox who were also described as being punk in some quarters - other than when they released their first albums but musically they have little in common.
Oh and punk died roundabout 1978 whatever bands like Green Day are they're not punk - I'd say they are to punk like The Yardbirds are to the blues!