It only takes one to kill

These Israeli mosquitos, or at least the West Bank version, are slippery, In America, mosquitos are easy marks; full of themselves, sluggish from too much grease-laden blood, sure of their own invulnerability. In Romania, they are stoics. Perhaps they care not for life at all, or perhaps they are so bewildered by the non-sense of life in the post-Communist era that they don't bother to try to escape the whipping washcloth that comes to seal their fate. These Israeli pests, on the other hand, are evasive. And it only takes one to buzz in your ear all night and leave your arms all welted by morning. Thus is the scenario for tonight.

Is using a phrase like "on the other hand" okay, or a sign of mediocre writing?

It is closing in on midnight. Since Shabbat, I have used the toilet, stood half-naked under the clear starry sky and smoked half a cigarette, looked at my plunging stock portfolio, paid my car insurance debt, taken some vitamins, check my email.

Yeah.