I actually know what my blood tastes like, it's similar to a coin like a penny or two-pence piece. And no, I don't have a habit of drinking blood, I simply tend to suck on minor wounds (like if I scratch myself or something). Easiest way to get rid of the blood if I don't have a tap or a tissue anywhere, or something...
Otherwise, I guess I'd be a little bit salty, but otherwise fairly bland, like chicken, as I don't tend to eat a lot of spicy stuff (don't get me wrong, I like eating spicy food and do so whenever possible, but I don't cook often, being a lazy student I miss a lot of meals and also tend to just buy pasta lunches from my student union shop...).