I bought a Wii, then sold it, then bought another one 18 months later, then sold that one. I don't know if it was my nostalgic attachment to Nintendo (I've owned every console they've made besides the Virtual Boy and the last 2 or so DS models), fear that I'd be missing out on franchises I was emotionally invested in (got the first one because I had to play Zelda and the second because of Mario Kart) or whatever, but I got frustrated with the whole system pretty quickly both times.
In terms of games, I preordered Haze about 8 months before it came out on the back of my unshakeable faith in Free Radical (even worse, I talked my flatmate into doing likewise) I rode the increasingly negative press and shockingly low early reviews like the good fanboy I was until the faithful day our copies arrived. It was a massive letdown but through a combination of my loyalty to Free Radical and my desire to justify our purchases to my flatmate, I forced myself through it, like a kid finishing his vegetables, before blissfully trading it in.