GW1 was more reactionary for some classes, especially as a monk or in PvP. Knowing when to hit the interrupt or healing was very dependent on your reaction time. GW1 had more skills, making the combat more diverse in that the player had more of a choice over what he wanted to do.
highlighted for wtf and you're wrong, so so very wrong. Unless you made a typo and meant GW2 is pretty much just spam all skills on recharge... I don't care how many hours you played of Guild Wars, I put over 11k hours in, playing all formats (albeit GvG was shortlived for me and I only participated in a few HA matches), but you cannot say GW2 is not reactionary.
Dodging is reactionary. That should be obvious. Tanking is actually less reactionary, because you can set yourself up to take less damage so you can enter a situation with an upper hand, as opposed to the reactionary method where you must be alert and ready to dodge to avoid damage. This should be obvious. Infact, Guild Wars had reactive skills too, and they were terrible. Empathy, Backfire and Spiteful Spirit were cookie cutter. Anet probably recognised this love for reactive skills and decided to create a whole new game and philosophy based on the idea of reactive skills and gameplay. They then told everyone they were doing the complete opposite of that and, using make-up sticks, their twisted 180º logic fooled you all. Because no one wants to really play a reactionary game; it sounds derogatory almost.
Anyway, I should just refer you to a previous rant post of mine from a while ago when this topic cropped up, but the crux is there's no skill involved and it's far more reactionary. Not having the option to pre-prot, buff your team's damage in any meaningful way or apply protection easily. Anet were careful this time to limit how we can deal and absorb damage; there are no unique damage types, melee/elemental buffs, support roles or true synergies in teams.
All this makes the combat system of GW2 shallow and boring. Go play Guild Wars again, relive the good times and play with seven pugs