I, too, was a bit disappointed that there was only one per class. I thought I had heard that there were a couple of classes that had two options, but that might have been old assumptions before people actually started hitting 50 (and finding out that some of those were actually temporary romances and therefore don't "count").
I haven't gotten Andronikos for my SI yet. I'm level 24 so I'm hoping it's coming up soon. One thing that irks me is that sometimes it seems there's a huge span of time between companions that you receive. For example, my sentinel got Kira at like...18 or something like that, and it wasn't until about level 38 or 39 that I finally got Doc. I wish they were spread out a little better.
But overall, I love the game and don't mind if it's not the epitome of perfection. It's only been out a few months, and I feel it's a really good game for being in its infancy.
P.S. I created my human JK, named Pereia (proud of myself for making up a neat name), played through one conversation, then felt overwhelmed at the prospect of getting 40 more levels. It's not that I don't want to start a new character, just not the same class as the one I've been playing for pretty much my whole time playing this game. That, and it would have felt forced to me. I was really excited about making my JK a twi'lek, and up until I got Doc I thought she was just the greatest thing since sliced bread and restarting her never crossed my mind. I let wild speculation on forums (and outdated/obsolete canon) get to me. I'm just like that.
To make a very long story short(ish), I feel like since nothing has been written upon stone tablets, the lore is pretty open to making it what I want. And even if Lucas changes his mind and says the Clone Wars Character Encyclopdia is no longer canon, and that twi'leks and humans cannot interbreed, what's to stop them from adopting or using science and/or medicine to do some kind of test tube baby? Humans IRL do that all the time for infertility (my husband and I may have to do that at some point, in fact), so why not in a Galaxy Far, Far Away where they have space travel and all sorts of technology? If the Sith can use Sith alchemy and magic to interbreed Sith and humans, why not twi'leks and humans?
Okay, this long-winded post is finally over. XD Thank you for the chat, Fievre, I enjoy it. ^_^