when I started listening to dancehall in the early 00s everyone was moaning about how it was better in the 90s
in the mid 00s everyone talked about riddims like Liquid (2001) as being a bygone age
now the same 'rubbish' 'jiggy' 'lightweight' riddims that people from 2002-06 moaned about are being hailed as the last peak for dancehall
I remember being aware back then that people had said the same things at pretty much every stage in reggae or dancehall or musical history before
the only difference now is that I sometimes find myself agreeing with the notion that dancehall isn't quite as good now as it used to be, but I would mainly put that down to the fact that the time when it was new and exciting for me is in the past; I'm more jaded now, I've got more to compare it to, I have less energy to trawl through endless new tunes to find the gems (I still do it though!)
I found when I was putting together my 25 years of digital dancehall mix the other day -
http://www.theheatwave.co.uk/events/item/rinse25feb10/ - that there was a huge surfeit of big tunes from 2003-06 or around that time. but that's probably just cos that's when I was most excited by buying records, I dunno.
in a detached, rational way I tend not to think that there is any/much material difference though
however, one thing that has definitely happened since the mid 00s is that it's become much much harder for producers to make money out of music. artists never made money from record sales so they're not affected. but it used to be worthwhile for small labels and producers to make music as they could make their money back. now things are so dominated by the bigger producers like don corleon, shane brown and stephen mcgregor that there is perhaps less variety in production styles
another thing that's happened is that some of the older big producers seem to have retired; possibly cos they are so established and comfortably off that it's simply not worth their time to make music for the current returns you get as a producer. I dunno though, that's a bit of speculation on my part. by people like this I mean dave kelly, tony kelly, bobby digital, richard 'shams' browne, sly & robbie and some other people I can't remember right now.