I agree that biggest flaw with Iconoclast is its samey-ness - apart from a handful of outliers like When All Is Lost, all the songs are of a similar nature. Still, I find it is pretty consistent in its quality. I'd definitely rate my least favourite song from Iconoclast higher than my least favourites from DWOT, The Odyssey, and in fact possibly every Symphony X album (its about the same as V and PL in that respect if I include only tracks I consider full songs, but if I include V's interludes and PL's intro Iconoclast trumps them).
Also, it's roughly on a par with the best Symphony X albums - they all have different pros and cons but in terms of how highly I regard them there's not much between V, The Odyssey and Iconoclast (or even Paradise Lost).