So just to update, played a match a couple nights ago 4v4 with friends. I got helicopter rushed on both sides by VDV and Spetznaz. I managed to catch the right flank attack and lay down a MLRS barrage on the landing Mi-8s but never saw the left flank force. They took out our entire rear area. My security forces were only able to harass them from that point on.
It took me the rest of the game to get back any type of artillery support, now supplied by a constant stream of HEMTT. The match ended in a bitter draw as we managed to hold our lines till the end.
They used no rocket artillery and their only support was a battery of 152s that was often firing not targeted.
So anyone doubting that you need rocket artillery to kill rocket artillery, thats a good example. It can be done, especially if you fail to put eyes on your flanks (we had mostly abandoned the right side of the map, we had one small force moving up through it but more so to draw their attention somewhat away from the main push up the left). Either he was totally missed by our left force, or they failed to notify me of it when they did spot them.
Though I have to say the guy who did rush me was acting sort of cheap. After I pounded one of his landing forces he got on global chat and demanded I leave because it clearly stated in the server rules that there was no arty allowed and I'd be kicked, a total lie seeing that the guy hosting the match was in TS with me and was calling for arty support at that very minute...