I've noticed a lot of people are assuming it's going to be successful simply because it's a popular IP and a popular developer. Well I'm sorry, but there have been other MMOs that have been based on a popular IP with popular developers behind them and it didn't stop them from failing. WAR, FFXIV, DCUO. All of these were based on popular IP's and had well known developers behind them and they all did badly.
If the game is bad, it's not going to do well. Sure, it may get a ton of pre-orders and initial sales (a lot of recent MMO 'failures' have done the same), but that doesn't mean much with an MMO. An MMO is all about sustained subscriptions and if the game is bad then they just aren't going to get them.
Does this mean I think TOR is going to fail? No, I honestly have no idea how well it's going to do and frankly, nobody else will for several months after release either. What I do know is it's going to go through the same sequence of events that virtually every recent big name MMO has gone through,
- there will be a lot of pre-orders, resulting in fanboys shouting about how it's going to be huge
- there will be a lot of initial sales, resulting in fanboys shouting about how it's going to kill WoW
- there will be people complaining that some features aren't as awesome as the developers made them sound, certain features didn't make it into the game and/or that it's not as polished as WoW and doesn't have as much content.
- it have a very significant drop in player numbers after the initial free month is over, resulting in many people shouting about how it's failed.
So in summary,
- popularity of IP/developer is not a good indication of how successful it will be
- a lot of initial sales, follwed by a large drop in population exactly 30 days after release
- we won't know how well it has done until several months after release
- anything a developer says should be taken with a pinch of salt
- fanboys and haters are idiots