Every game I have played the last 4 days has had a Smerch spammer. You know how you beat that? When you play with friends, have a dedicated artillery person. Put up a Gazelle or a Kiowa near where their rockets are coming from and counter-battery that stuff. CB works in this game, it really really does. Its not cheap, its how it would be in real life, and I have NEVER seen anyone send down recon choppers on myself, not once. It also helps that you have parameter defenses and good surface to air systems spread out.
Rocket/Arty spamming is easy to defeat if you actually have half an ounce of brains. Massing units and globbing together in a rush on objectives like this is Starcraft is not going to turn out good. A mechanized company's line is not 500m wide! Not in this game, not in real life.
When I spam Smerch, do you really think I'm not doing the same to you, whilst also making sure your inevitable recon helis, and airbourne inf attacks do not succeed? Anyone using arty or rockets without lots of recon is doomed to failure. I love it when people counter arty me, because it usually means a blob of high priced units and FOBs for me to Smerch, whilst my teammates have 1 less opponent to worry about.
No, I expect that, but like I said, having a defensive network that can watch for helicopters or deployed recon teams really helps eliminate the threat of accurate indirect fire.
Of course if there is accurate fire coming in the first thing I do is move my artillery pieces out and start shoot'n'scooting... :p A well coordinated attack with 3 players on offense and another playing general support is usually enough to beat down most anyone.