1. The tiefling's ability to hit back against a foe who just hit them is +1 attack, +cha damage. For reasons unknown, the pregen tieflings all have low charisma. I think this ability is a lot cooler if you're playing a character with better charisma, such as a Warlock or a charisma based Warlord.
2. It seems very likely that the half-elf gets +2 Cha +2 stat of his choice. Getting two stat bonuses, one of which is floating, is a pretty sweet bonus. I don't think the pregens have used this as well as they could. Furthermore, the ability to take an at will from another class and use it as a per encoutner ability is the sort of thing that will get better as more classes are released. So again, I think there's potential here.
3. You seem to rate poorly the races who's primary benefits are more subtle. I know that the elf and the eladrin get flashy abilities that are very noticeable and which, when used, can noticeably change the course of battle, but my personal preference is for abilities that slowly, subtly alter the course of the game in my favor. That means that races like Human are particularly nice for me. The +1 defenses is subtle, but it helps. Same with the bonus feat that can let you select +1 to saves. Or the bonus skill, which gives you a small but noticeable increase in the number of times you can say "Oh, I can do that" when something comes up out of combat. Or the +1 at will, which lets you add diversity to your attack choices, and makes you more likely to have the right tool for the job at any given moment. I can see why other people wouldn't find these exciting, but its the sort of thing I go for.