Look, Just because it evolves straight into it's stage 2 form (for the cost of 2 energies mind you) doesn't mean it is broken.
In fact, It is a far from broken evolution line. You normally get Stage 2's out on the 2nd turn anyways. And as such a crucial stage in the game, why on earth would you waste cards that you will need to setup on alakazam's power?
Alakazam - if it can even be called good - and assuming someone actually uses it - would only ever use it mid-game. I.E. after they setup, and even then...They would candy into it...They would not waste the energy nor risk it dying before it can become an alakazam/when it does become an alakazam.
the Alakazam line is far from broken - and Alakazam is far from broken.