Really? It is actually pretty common to have the pros and cons, positives and negatives and so on of something you are for or against. I love WoW but I am critical of aspects of the game and things they have gotten wrong. I am negative of SC but they have done some things well and other things they are lacking.
If someone is 100% positive for something that is a red flag. If someone is 100% negative of something that is ALSO a red flag. You think it is normal to support something and be 100% okay with every single thing about it?
It is like if I have a favorite place to eat and I get good service most of the time and the food is great, you think I am going to ignore the times I get shit service, or a wrong order, or a super late order and so on? No. That colors my impression of the thing. It is a negative in what is usually a great thing. But it is fine, if someone cannot be critical of something they are supporting it means they are more like fanatical about it, paid to be that way or trolling.