I'll stick my head above the parapet to support you on this one, Jem 
Early Simple Minds is really very good... New Gold Dream is a brilliant synthpop album pretty much from start to finish (Big Sleep a personal fave). Street Fighting Years from '89 bar one or two dodgy attempts at stadium rawk is pretty good too... I'll even go the whole hog and say there are parts of Real Life that are ace
it's a guilty pleasure.
I think it was towards the end of the 80s/early 90s they started to lose it badly which is where most of the ridicule comes in. Bare chested, air punching tributes to Nelson Mandela, songs with a "political" slant and impersonal stadium gigs etc sort of finished them off as a band you could relate to. Although it is interesting U2 did the exact same thing and they emerged twice as popular whereas Simple Minds were completely and utterly derided into obscurity. Bono is twice the knob Jim Kerr could ever hope to be.
Last album I checked out was Good News From The Next World in '95 which isn't that bad actually... the band look unrecognisable on the inner sleeve (think a long haired grunge look) haven't bothered following them that much since...
Hat off to them though for having the balls to play an album like New Gold Dream live in it's entirety 25 years on... say what you will about Simple Minds, you couldn't exactly see New Order doing that with PC&L or Low-life so a bit of respect there
they know what their fans want and duly oblige.
Rather than playing the same tired greatest hits set list all the time 