Those that are new to MMO's may not fully appreciate this topics title. Let me explain. In most MMO's the "Real" game does not start until you reach the highest level and begin running the "so-called end-game content". Take the king of MMOS, WoW, as an example. The road from 1-85 is an excruciating one where nothing you do will have any impact on your toon at level 85. It is called a "grind" for a reason. WoW is not the only culprit here. Most MMOs follow this same broken paradigm.
SWTOR breaks the paradigm and sets a new one.
In SWTOR the "Real" game starts the moment you see the first cut-scene of your character. Starting at level 1 the decisions you make FORM your character. Each mission, each answer you chose has an impact. The game starts at level 1 -- not at the level end-cap! People, this is HUGE! It is genre-setting! It blows away the current MMO paraqdigm of grinding to end-cap levels.
This is why SWTOR succeeds. It is ground breaking in its approach. It amazingly combines the single player aspect with the MMO one. Dont let the complainers fool you either. There is an absolute TON of group content in this game. Yes -- It is an MMO in every aspect of the word EXCEPT it breaks the grind.
Your SWTOR life begins at level 1.