I prefer simple logos, because they're not too much 'in your face' and are to the point. Flashy ones could be distracting and effect the site/forum it's displayed on.
The best logos usually aren't visually complicated, because they need to be placed on a very large variety of media. The amazon logo looks good either on a website, or impressed into the back of one of their devices.
I hate gradients. I think they look tacky and just plain horrible. 😛 I prefer simple and flat logos, they are easier, modern, and they tend to look better. :lol: