I don't understand and I don't like to speculate. I hate when people say things like that. It could be 2 things, a positive or negative statement. If it's uncertain, typically people view comments in a negative perspective. Even if it wasn't.
You should ask, what do you mean by that? It's good when working in a group to mesh evenly. You don't want to overachieve or underachieve in a group setting. Great teamwork is when everyone pulls their weight evenly.