oh and re: hamburgerboy, there's nothing wrong with fusions in and of themselves, it's just that in practice they tend to borrow the most superficial aspects of genres rather than growing organically into a hybrid. the best fusion bands usually have a background in and passion for multiple genres, but most are just concerned with being the next fresh thing and sounding different, resulting in soulless and pointless experimentation. there's nothing wrong with blackgaze as a concept (although the term is really yucky let's face it) for example, the problem is it's usually blending C- black metal with C- shoegaze because they think just spanning genres or jumping on the latest bandwagon is enough. most bands aren't doing it for the right reasons, i.e. to communicate genuine emotion or a vision.
95% of modern 'fusion' metal, particularly since the internet globalised everything and got a lot of non-metal folks wanting to dabble in the genre, just conveys the impression that the band has sat down and thought 'hmmmm i wanna make something experimental and artistic... what's never been blended together before guys? find some obscure genres on wikipedia!' this is why there's always been such an insular backlash from old-schoolers in various genres, stubbornly idolising stuff just for being derivatively traditional, as though merely demonstrating an affection for real metal, demonstrating that you're one of us, is enough to make your music good (it's not... but i sympathise). it's a kneejerk response to the way a lot of modern stuff, although flying the flag of their beloved genre, is actually approaching it from the outside without a sense of its history, using its surface attributes to bring novelty to music that has little to do with the genre's roots or what it stands for at all. it's a somewhat sad state of affairs... on the one side there's shallow bastardisation and on the other there's the generic old-school, and only a small minority in between is actually still evolving these genres in a major way from within.