As long as you understand the whole situation then having a bias is okay. I don't enjoy SEGA consoles as much as Nintendo consoles, and so don't go out buying them, although I won't go forcing that view down people's throats.
I will force my bias towards Pokémon at people, because they treat me like crap otherwise. They assume things that aren't true about Pokémon and players, and I want to drive that out of people. I won't make people buy Hey You, Pikachu! though...
Bias is fine as long as you know what you're talking about.
Pocket Monster Island -
http://fryguy64.tripod.comPokémon guides, downloads and info.