I don't understand the product or companies well, however what you explain is exactly how I felt after reading their post. This kind of thing doesn't even need to be public, let alone posted on the company blog. Calling ADP out about their "corporate value" at the end was unadulterated mud slinging.

It's understandable that they're upset but they should work to keep these problems from spreading outside of their legal team and not get flustered with their competition. From the sound of it they've completely taken their eye off the ball for this distraction and it could easily pave the way for ADP to steamroll them competitively while they sop up their tears.