There's nothing wrong with positive opinion. I'd much prefer somebody express themself by saying, "I love coding in Python" rather than saying "I hate programming in C++".
Surely you have an endless amount of positive things to say about the projects you've worked on, the things you like, and the people you've worked with.
Having a positive opinion of something doesn't diminish the value of anything else. It also tells me something useful about you, something I can work with.
Ask yourself, would you prefer to work with an overlay negative, or an overly positive person? How much more would the negative person have to bring to the position to make it worth it to deal with their attitude?
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