At the moment, it's technically only 5 vs. 2, as Speculum and Defender are not directly fighting the two Sentinels atm, and Sword and Shield isn't quite there yet either, but I do these sort of odds for a reason. Remember, that before all this happened storywise, these Sentinels were Gold Tribe members just like the rest of them. However, when everything started happening, and Auron and the 'Sentinels' came back, their strength exponentially increased. Recall that it took three Gold Tribe members (Vigil, Defender, and Sword and Shield), to take down Beserker, and he was probably the weakest of the pack. Stingray is basically correct, baddies don't have a number advantage, but they do have a power boost, so to speak.
This is not to say, however, that it will remain in these odds forever. Just like in a Pokemon game, the RPers will gain experience and strength over time, and eventually balance each other out, to the point where one Gold Tribe member may be able to defeat one Sentinel. But, as it stands now, it'll take everyone working together to win. Do your best!
Good questions everyone, by the way. I'm glad you ask stuff like this.
I'll be posting once I get home from uni tonight.
@Stingray Oh, by the way. I'm having a hard time keeping up with your character's name. In your recent posts, you started using 'Kivir' a lot, but before that, you were using Kirdir, Kirvir, and such. In your SU, I believe you also used Kirvir. So...which one is it? xD