Having played this game since beta and leveling 2 characters to 50 (should hit 50 today with my vanguard) I will say the game is interesting.
SWTOR aims at taking the MMO genre to the next level where you have an overarching story mode for your character. In essence this feels like a single player game with MMO concepts behind it similarly to what you see in Guild Wars or so i've heard. The eight classes have their own story line that takes them from level 1 to the ending level 50 current cap. Every aspect of the game has a story behind it which is very reminiscent of Everquest/Everquest 2 where you can be running the standard fetch, kill, and/or collect mission. However, the story behind it is animated leaving you a reason to sit and listen if you want.
Each class is unique for their side, but they can be considered carbon copies of their light side counter-part. Sith Inquisitor and Jedi Consular being an example where 1 shoots lightning the other...well shoots air + rocks. Some classes are more interesting than others such as the smuggler vs imperial agent. With your take no prisoner gunslinger you are a dual wielding machine taking charge. As a sniper you deal extreme high damage and pay the price with charge/casting timers + long waits. However, that upfront extreme damage is pretty sick since you can nearly 1 shot some creatures/NPCs.
Overall i've found the game enjoyable, but it is lacking in the content department. That being said I am giving Bioware leeway here due to several factors:
1. MMO Games in General - These are never easy to make since you have multiple things to worry about along with the normal release game problems. Have to maintain servers, fix bugs/glitches/exploits, maintain balance between classes, etc... .
2. Release Woes - In every single MMO i've played at the beginning there are always people bemoaning it saying "This should have been released at the start." With game update 1.2 on the horizon they are releasing tons of new stuff which people are loving, but already berating. Examples are rated warzones/battle grounds, Legacy System, Custom UI content, Logs, Advanced character customization (same model appearance across the board), and new operation (raids), flash point (group zone), and War Zone (Battle ground). People are mainly complaining about the WZs where there's only 3 of them and some hating Huttball (think American football).
3. New Kid - With #1 and #2 it's hard to be a new kid on the block releasing your first MMO even with professionally experienced staff. Really hoping that the game doesn't come back to bit BW in the butt.
Still reserving "true" judgment for the game, but as it stands right now I would give it a generous 8 out of 10. It's a diamond in the rough that requires a good polishing to make it shine. As we all know SWG is dead and buried thanks to SOE so this will be our SW MMO. If they work on it correctly the devs can make the game a very great addition to compete with WoW (screw the pandas

). However, I will be keeping a heavy eye on it to make sure the game doesn't become stale.