No.
Should an employer be able to not provide health insurance coverage? I believe so - there's no fundamental reason to require the two to be linked. Therefore they should be able to provide partial coverage also, so long as they are up front about it.
I suppose the difference is that many would rule out a job that wouldn't provide any health care, but may overlook the fine print and/or not expect to need chemotherapy (or another procedure for instance) before hiring.
That said, health care should not be employer-based.
Poll
