Today I had a great game against @Mephiston, his Guard versus my Tyranids. I had some lucky saves but mostly got shot up real bad by tanks - but just killing the bugs is not enough, they're very sneaky scorers and quite a lot of points were put on the board by the little ones while the big ones were dying just a bit too slowly for Chris' plans to work
So the tank commanders can very justly post a victory, but their superiors might look at the strategic map with some concern...