The passion surrounding the sparkler debate could probably feed the national grid. My approach is based on respecting regional difference. Just as a southern beer is not designed to be served through a sparkler, many northern beers are not the same when dispensed without. (Hop levels are tweaked to take account of the tighter dispense). I try, although often fail, to get the beer poured accordingly. Still think Sean Franklin, of Roosters Brewery, explains it the best:
http://roosters.co.uk/wordpress/?page_id=777