I wish they had made the base classes viable, and not force you to choose an advanced class. It wouldn't be difficult. A class can be viable without as many skill options, as long as the skills they do get are good enough to get by with.
In Ragnarok Online, you get more than one chance to advance your class to another class, but you can also stay where you are and be perfectly viable. So before any of you have some smarmy, ignorant retort to what I said, go check Ragnarok Online for an example of how it can be done, and don't tell me it is unreasonable.
Well while I haven't checked out that game, I think this is an interesting concept. It would be even more amazing if not choosing an advanced class gave you different ability options than sorc/assassin.
On an irrelevant side note, I saw someone who was awesome the other day in a lvl 50 warzone. He was a sith inquisitor who never chose an advanced class. He did terrible, but it was still amazing to see.