As an Australian I can relate to this. Often American's think I'm putting our startup down, just because I'm not overly excited saying everything is awesome and fantastic. I'm extremely positive and have absolute confidence that we will succeed. But I prefer to look at things objectively and to tackle the problems. However American's translate my language into "my startup sucks". So recently I've been training myself…
I think I could have a top-tier international corporation and still have to force myself to describe my product or service as great. I'd probably try to qualify it as opinion - "Well, I think it's pretty good."