While I do not wish to take away from anyone who is planning to raid with 8-people, and while also saying I alwasy enjoyed 10-man raiding in WoW to 25-mans simply do to how close I was able to get within a smaller group of people rather than being a faceless name in a crowd as I often felt in 25-mans... I will say in WoW 10-man raiding is easier simply because you don't have to rely on so many people to do their job. Now it is a lot easier to be bad in 25-mans than it is to be bad in 10-mans, but you will never be able to get around it is easier to develop a strategy and organize 10 people than it is to do that for 25 people. Likewise it is easier to organize 8 people than 16 people. Do not let that take away from your accomplishments, but also do not be upset when a 16-guild gets more respect than you even if you end up downing the boss first on 8-man. It doesn't mean you are bad, but you certainly didn't complete the same feet that the 16-man guild did.
To be honest, I really wish Bioware didn't have separate sized raids in SWTOR. It must take a great deal of development time balancing a raid twice for two different sized groups as I'm sure it's not just a matter of "double the damage and health of everything". 16 is a good number of raiders imo. Not so big that recruiting becomes difficult, and not so small where you don't even feel like you are raiding. 8-people is only 3 more than WoW's 5-man instance model. Hard to feel overly heroic in a group so small, but that is my opinion.