I have followed the band's evolvement for years, almost from the beginnig, but really can't tell how many times Tuomas has underlined in numerous interviews that his idea of the band was, is and will be the music they make together. According to him the band is not about the individuals showing off their undoubtably vast talents and capabilities with their instruments - includung vocals - but to perform music as a tight unit.
In spring 2004 before the release of Once Tuomas remarkably stated in all interviews the fact that he wanted Tarja to be only one of the instruments in the band, nothing more. (Maybe she felt neglected because of that, who knows?)
Emppu is quite a wizard with his ESP, but his solos are limited to few and rare and only serving the composition in question. Everybody knows he could do more, but he has accepted his role in the band as Mr. Guitarwall and concentrates on making the best of it.
Jukka has said that he'd never want to play drum solos because there isn't much more boring things in music than a drum solo.
Marco, one of the most appreciated rock/metal musicians in Finland, has a double role in the band as bass player and second singer. Despite he knows his value very well, he says he never wanted any bigger role in Nightwish. His larger role as a singer on DPP doesn't mean the band would be heading towards increasing role of male vocals on the future releases. This time only some parts of certain lyrics were too personally pointed to Tarja and Marcelo, hence the guys felt that it'd be unfair to make Anette to do it, since she has nothing to do with the past incidents the lyrics refer to.
Tuomas has also always wanted to compose soundtracks for movies, hence his enthusiam towards using big orchestra and choir(s). If you think about it, the very first impact anyone gets from listenign to a Nightwish track, old or new, will be how big the sound is. Even on the first three records when they had no money to hire an orchestra, the distictive big sound of the band hits the listener like a sledgehammer. It'll be even more evident when you get to see tehm live. Very rare five-piece bands can match the overwhelming sound of early Nightwish, not to speak about the more recent output with a real orchestra. And by sound I don't mean decibels, but impression of the music and melodies in it.
For many musically uneducated people Tarja's classical singing became the clou of the band, but most times it only reflected the opinion of a musically illiterate person who couldn't hear the the music behind her poweful vocals. (I won't say
her classical vocals, because I've been to Tarja's solo concert where she sung classical, and believe me, there is a difference!)
Personal tastes aside, clinical observing of the structures in Tuomas's compositions from the musical and technical point of view will easily reveal us that we are not dealing with ordinary consumer music. Calling Nw pop(pish) really doesn't make any justice, but only shows the critics' ignorance and lack of deeper knowledge in music. Pop is something easy listening on the background while doing something more important, it doesn't take a brain to observe details or understand the lyrics (if they make any sense at all) and the song usually vanishes from the listener as soon as the last tones disappear, without leaving anything to recall later.
Dark Passion Play is a something you rather want to play in quality player, concentrate on and work through several times, preferably with lyric sheet in your hands before it'll fully open to you. Anette is an excellent singer who can really sing in many various styles and express deep emotions when needed. But she isn't Tarja, she is Anette and there is a difference in overall singing style between the two. But not in quality, no way.
Also, there are so many details in the music, that even after numerous listens one will discover something new on every spin. That is the thing which separetes consumer pop from more sophisticated music.
Anyone's personal taste and musical preferences will be sources for a completely different story.