I wouldn't read too much into it. They play the admissions game, they want the best students, naturally; but it's not like they're usually genuinely impressed by xyz's undergrad work. It's not like it's a job market thing when you've got (semi) serious research under your belt and you're getting a fulltime position. (Yes, I got an email like this, it was a nice touch, sure, but I wouldn't freak out about it.)
Don't take it personally, my intention is not to offend. I agree with most of what was said above, I just don't think it should be a deciding factor or anything.
Feel free to downvote. Cheers.