I don't know why, but I always wanted a genesis back in the days. My parents asked about a SNES, but I wanted that genesis. My neighbour and best friend had a SNES, it was a win/win situation for two 10years old boys. No Fanboy-wars those days :D
The N64 was the way to go after Sega wasn't on my radar anymore. It just had the better graphics. The N64 was a great console (for me). The only bad thing was the "easy-to-break-controller". But GoldenEye, Mario Kart 64, Zelda Ocarina of Time, Mario 64, Wave Race and Extreme G were awesome.
I bought my Dreamcast because of the brand. I wanted to get my Sega back. And damn, that was a lucky shot. One (or THE) of the best consoles EVER. Sadly ahead of its time. But Shenmue I / II, Resident Evil Code Veronica, Sonic, Crazy Taxi were great games.
I bought the original Xbox, because it was technically the best console out there. Halo1, Halo2, Fable, CounterStrike, Splinter Cell, Doom3 and finally the ability to play online made this console worth it.
The Xbox360 was a bought, because of the brand, Halo, my clanmates, and technical improvements. And I don't regret it at all. The Xbox360 delivers games I wouldn't have thought of to play this gen. GTA IV, DMC, Tekken, Final Fantasy, Resident Evil etc.
The only console I actually sold, because I didn't like it was the PS1. It was inferior to the N64 IMO. Loading-times and the controller killed any possible fun. That is where the Playstation brand lost me. The controller hasn't changed since then.