Ignoring your badly-placed diatribe (TOR's downfall won't be philosopher's stone to returning the MMO genre to the days of no-life-EQ-gaming, despite how you wish it were), the following are the problems of TOR:
1) Crappy engine: one of the things that really cause trouble is how garbage the Hero engine is (not as bad as crystal tools, but its down there). Worst of all is that Bioware built the game on an outdated version of the Hero engine and supposedly declined to receiving updates from the guys who made it.
2) Lacking class balance: In retrospect, all the classes were designed seemingly with a single-player game in mind, and it shows when the jedi consular rose to being the "only" viable healer. Not to account the amount of brokeness in PvP.
3) Lack of endgame content: Much like FFXIV(!), TOR doesn't have much in the way of high level content. Hence why the operations were released in a state some consider premature, flashpoints were not properly tuned and so on.
4) Imbalance of population: In one of the few times aesthetics harm rather than help, Sith outnumbered Republic players considerably since launch because people liked the Sith. That's REALLY bad in a game with a PvP element.
Casual-friendly had nothing to do with TOR's issues. Bioware just made a crapton of bad design decisions and it bit them in the ass.
What I find funny about the OP is that even the WoW crowd looks at TOR and points out these technical issues and bad decisions over saying "0mg w0w clon fa1lz bring bak n0-lifez tr0ll0ll". The Hero engine is a technical issue. The decision of launching the game with barely any PvE content was a bad decisions. Sith Inquisitors and Jedi Consulars making the hop to live OPd like they were in beta was a bad decision. Skimming on a lot of the stuff they wanted to add was a bad decision. Launching without the basic MMO tools was a bad decision.
...in a way, TOR is pretty much FFXIV but without the company behind it willing to pump money into fixing the game. Knowing EA, they'll dump the game soon enough. Not that I didn't see any of it coming, because when I saw that people like the guy behind WAR's Bright Wizard fiasco was on the TOR team, I sensed a great disturbance in the Force. :O