Like in mot RPG i've played, I'm probably going to play a human because they are easier to identify to, especially in a fantastic universe I won't be familiar with on game launch. I would hope that they are well balanced with other species.
Also, I disagree that humans have to be the base. In fact, one cool thing about us, is that we are built for extreme physical resistance. Here is an example: We sweat during physical intense physical exercise, this is our way to regulate our body temperature and it allows us to regulate our body temperature while moving, this allows us to run longer distances then other animals who controls body temperatures but breathing (like dogs and cats for example). Those animals can run faster then us but never as long then us (if you are in good physical shape that is). This fact is a serious advantage in a warm dry environment but can prove lethal in cold environment and useless in a very humid environment. SO technically, humans are better at physical resistance in most environment found on earth.
so the start point should always be a base which offers no bonus of defects like, how easy it is for me to survive in environment A and why. Lets take "darkvison" for an example. We consider this an advantage because we can't see in the dark, but in the case were they've adapted to see only in the dark, we both can see 50% of the time on the surface, meaning that in reality, we're pretty much equals. If the creature that can see in the dark only lives underground, then yes, it would have an advantage but that creature would live in an environment where everybody else can do the same, cancelling this advantage most of the time because creature who needs light won't be in competing with those who don't like light 99% of the time.
TDLR: If a specie really had a significant advantage over the other that is not balanced out by anything, eventually, one will completely dominate the other, either by predation or by breeding them out (in the case of subspecies). That's why I think, logically, all existing species should be equivalent to another and therefore, human should also have bonus.