I'm not sure I would say that triple distilation equates to less flavour, rather that the flavours it does have are more constrained within a certain range (ie fruity). And the higher abv gives them more flexibility when it comes to diluting the new make before it gets casked, which can have a big impact in the final products flavour. I'm not sure I explained that very well, but hopefully you get the gist of it.
Part of the image problem triple distilled scotch has is that the only one most people are aware of is Auchentoshan, and to be frank their owners are bloody awful when it comes to what they put out. It's far too often 40% abv, chill-filtered to within an inch of its life and that inch is drowned in caramel colouring. Needless to say I am not a fan of Beam Suntory, they own my 2 least favourite distilleries in Auchentoshan and Bowmore. Ardmore isn't great either, although at least laphroaig has a couple of decent expressions. Independent bottlers of Auchentoshan and Bowmore show that the whisky itself isn't naturally bad, as there are some great IB versions, it's just how they are made to put it out by those in charge. To be honest I actually feel a bit sorry for the people that work at those distilleries, knowing they are capable of making some great whisky, but being stopped from putting it out as good as it can be by the money people.
Er, went a bit off topic there. Rant over!