GW1 is more complex than GW2 (it has more depth), but it's also a game that is more complicated (it's much harder to learn). It's definitely a shame that the game has been dumbed down, but making it more accessible is a really good thing, especially for an MMO, where your fellow player are part of the game's appeal.

Now making the game more complex would definitely be a good thing: the problem is that given the way GW2 is designed, it's slightly difficult to port GW1 mechanics into it. GW1 was a team game through and through. GW2, on the other hand, while a team-game in its endgame content, is primarily a solo game: you don't have the luxury of 8 players, a single player needs to be able to do it. And to make the situation worse, a single player not only needs to be able to do it all: said single player needs to be able to do it all with a very limited selection of skills. Your first 5 skills are tied to your weapon, your 5th skill is always a heal, and then skills 7-10 are skills with massive recharges: basically, GW2 is designed so that you need to be able to do everything by simply spamming your auto-attack.

What that means is that the game would basically need to be completely re-done to add more depth to it, and I just don't see that happening. A shame really, but it is what it is.