I understand why your game goes through the two-button phase. It gives new players a moment to learn things before adding complexity. Maybe it is comforting for people on their first MMO. You have a little/auto-attack and a bigger attack. Maybe it is a melee attack and a ranged attack. Whatever it is, when you are in the tutorial, you have two things you can do other than moving around.
It is very important for your game to get past this phase as soon as possible. The longer I sit there with just two buttons, killing three flavors of rat ten times each, the less likely I am to think that anything awesome lies behind it all. Giving me something non-interactive next is fine. Armor, a defense, a buff or heal that I will not need in the intro, fine. Very soon after, give me something shiny to hit things with. If I am still in the two-button phase ten minutes into things, I am probably logging off and never coming back.