I've had opposite experience. In my case, they were sharp but they were also toxic to be working in a team. So, we had to move our R&D centre to Poland.
I'm not the person you replied to, but I suspect they tend to be very headstrong and don't have a problem telling you that you are wrong with vigor. Then are willing to argue the point for an hour or two.
If you are not accustomed to it, it can be a shock, but it certainly can lead to finding the best solution.
