Runs out in August (6-mo Sub, I had high hopes): [2x lv50's, 2x lv44's, both sides]
1. Too much, too soon.
-From level 10, I was already a hero and saving the galaxy. I saved the galaxy over and over and over again until I became numb to it somewhere around lv30. The most elite soldiers of the Republic/Empire couldn't do it, but Kaliyo and I could! Riiiight. Too much, too soon. I didn't feel like I had to work for my reputation with the Republic/Empire. Make everybody the hero too soon, it becomes transparent and meaningless.
2. Every planet the same.
-"Welcome to X. We have issues. Will you save our planet?" Yeah, sure *yawn*, can I visit the cantina first? That long walk out the airlock for no reason wore me out. "You don't understand, you need to help NOW... our most elite soldiers have been decimated fighting a major threat! However, you and your companion seem to be better than them." Kaliyo and I proceed to fight group after group of nameless troopers and snipers, and somewhere along this mind-numbing slaughter the planet gets saved and I am a hero. Again... and again... and again. Every planet the same.
3. I was running a pest control business, not fighting for the Republic/Empire
-No matter where I went to quest, or what planet I was on, NPC's were exactly the same with zero variety. Group after bloody group of nameless troopers and snipers. Occasionally a droid... that was a trooper/sniper class. Oh yeah, sometimes they had vibroswords and were stealthed. As I gazed onto the landscape of every planet, I imagined myself with an Orkin logo on my armor. The Orkin man has arrived, I see that every square inch of landscape is infested with groups of nameless troopers and snipers! Never fear, my associate Kaliyo and I will exterminate these pests. Every planet, every quest, every zone... clear 5 billion groups of troopers and snipers and save the galaxy. Zero variety, zero fun. All the way to 50.
-Hey Kaliyo, those Esh'ka sound freaky! Let's go get us some! "You and me agent!" Hey Kal... is it just me, or are these dudes just... groups of troopers and snipers again? Ah, but an alien is now holding the gatling gun, so it must be different...
-New daily zone? Hey... check it out Kaliyo! More groups of troopers and snipers!
-I never felt like I was fighting for a greater cause, just mindlessly exterminating pests.
4. No "races."
-That's right. We get to pick a human, or a painted human. Mirilian? Nope sorry, human painted green with squares on their faces. But hey, good start on the Twi'leks with the handlebars. Too bad their animations and everything else about them is human. Same height/weight, same animations, same look in armor, same voice actors. Admit it, we only got one "race" to choose from. Zero variety. No wonder there was so little talk about which "races" would be introduced into the game... they were still trying to figure out how many different ways they could paint the humans and hope people wouldn't really notice.
5. No consequence.
-Funny how Grand Master Shan, in all her infinite Force-sensing wisdom, didn't seem to give a flying womprat about my friend's veiny sith-corrupted face. She still gave him the same quests as me. Our choices meant nothing in this game, except to introduce a little fun into conversations. Ultimately, evil Jedi are still Jedi. 100% dark side, yet they still serve the Republic.
-Quest choices also meant nothing. Whether you say "I'm a noble Jedi, I don't need a reward;" or "I don't work for free scumbag, I want a bonus;" or "I'm going to kill you," you get the same bloody reward for every quest. Sure, some of the outcomes are different for light/dark choices, but ultimately nothing changes except a few in-game mails.
-Why introduce a morality system if nothing is ultimately affected?
Plenty more, those are the top 5.