The grey walls of the burn fit in perfectly with the grey town, factories, sky, etc. The harshness or the edges fit in perfectly with the feel of the course. Whether it was a good idea or not originally, those walls have become part of carnoustie, and i wouldn't want to see them go. Remember VDV's ball bounced on the top of one of the walls... if it was all grassy and smooth it would have gone into the burn on the second shot and he would have won the Open. It's part of history. Carnoustie isn't meant to be pretty. I mean they got rid of the old innercity toilet block architecture clubhouse... next thing you know people will be wanting flowers all over the course :-)
I grew up playing the medal at Carnoustie, and just as London is a mess that you at first think could have been so much nicer if preserved (but then you grow to realise it's brilliance), so you eventually grow to appreciate that horrible concrete walls and grey skies are part of what makes carnoustie so great.