Heya! Caol here, probably a bit late for a response here but I figured I might as well give my view etc...
I've not raided much in the past. Did som 10-mans in Cataclysm but that's about it (muti rogue) and I would definitely label myself as an inexperienced/nab raider.
I'm definitely up for trying out the SWTOR raids but I also feel I've still got a lot to experience in the game. I have not yet tried the hard modes for example, what I mean is that I'm not rushing and I'm also a bit of an altoholic so my attention is a bit divided between my chars...
oh btw. I now got a shadow dps, working on a gunslinger, sentinel and most recently a Combat medic. Time will tell what will stick
I'm also very curious on the Shadow tanking side of things but I'd prefer to do it as a dual spec (whenever/if that will happen) so I'll probably wait with that (tho if a respec is needed for the guild it's not a problem!)