I think it's a little odd there's no trio, but it'll be nice to have a break from Legendary overload. I've been playing since Platinum and I've only caught... Suicune, Zapdos, Mewtwo, Reshiram, Zekrom, Tornadus, Thundurus, Landorus, Virizion, Cobalion and Terakion. Most of those were because I was going to wipe my copy of White and I didn't want to lose the chance for extra Legendaries. I don't go Legendary hunting until I'm ready to soft reset for a few hours.
It looks like Xerneas and Yveltal have high catch rates. This is good.