"$arrayOfObjects | ConvertTo-Csv" will create one row per object in the array, with a column for each public field of the object. That's exactly what happened,

"$arrayOfObjects | ConvertTo-Csv" will create one row per object in the array, with a column for each public field of the object. That's exactly what happened, and it seems like a reasonable behavior to me. Do you have an alternative? Maybe for the edge case where the contents of the CSV is a list of primitives, it should give you a "Value" column? Or did you expect that, given an array of stuff, the best approach is to encode the whole array in a single CSV row?