this is just off the cuff, and maybe the analogy doesn't work, but if you have pretty much any statistic (or financial asset as I'm thinking about), you can analyze its performance by standard deviation. Somebody who is streaky will have their overall average, but their periodic deviations are going to be greater than somebody who is not quite as streaky. In general, something -- a statistic, or an asset for example -- with greater standard deviation is not as valuable as the same something with lower standard deviation. So in that sense, too, streakiness is bad.
PS: I think that Gehringer_2 maybe said this, too. Or, this_2