I just can't ignore this. Did you actually read what you typed here?
Let's try your definition again:
How exactly can you prove to me, true or false, that one was better than the other without it being influenced by your personal opinion?An objective claim is a statement about a factual matter-one that can be proved true or false, not influenced by personal feelings, interpretations, or prejudice; based on facts; unbiased.
Prove to me from a completely objective standpoint how an apple tastes better than an orange.
It's not something that is possible, because it is literally 100% based on personal preference, as is your rating of which expansion is better. I can say that I "objectively" think that Warlords of Draenor is the best expansion because it had great cutscenes in it. Does that mean that everyone has to think it's better now, and that it's the best expansion just because I "objectively" said so?
That's not how it works. When you use that word, think of it like this:
"Looking at it objectively, the 1080p television has better picture quality than the 720p television and is superior."
This is something that can be backed up by hard facts; the more pixels per inch, etc make it a more detailed picture and this cannot be disputed because it is based on fact.