It’s tough to improve things you can’t measure (or know when they are improved). If something is worth improving it’s worth trying to find a way to measure it. In a startup you need to be conscious of how you allocate resources. My suggestion is that you determine a few goals for your team, determine what stats measure progress toward those goals, then build the tools to monitor your progress. Get the whole team involved to create a common sense of progress and get everyone thinking about this common goal.
Measure what matters – then improve it.