Eccleston was my first Doctor too, and I fracking LOVED him. Seriously. I still consider The Empty Child/The Doctor Dances as one of my favorite Who story lines of all time. I HATED it when he left and was replaced by that guy with the weird hair and the sneakers.
But then Tennant became MY doctor. He's the one that made me fall in love with the show, the character, the mythos, the whole thing. Seeing him go was heart breaking, seriously. But this new guy has promise.. and more than faith in him I have faith in Moffat, who quickly became my favorite who writer, by far. So I'm really looking forward to this season, even if it's not MY doctor anymore.
Hey, who knows, maybe Smith will replace Tennant in my heart as MY doctor. I doubt it, but I'll give him the chance just as Tennant had, y'know? The series can still be as good or even better than Tennant's without MY doctor being in it.