I'm not argueing, i'm just giving a review to whoever enough patient to read this far.
1) Don't judge the game if you haven't play skirmish yet. Campaign's easy or normal just let you to do whatever to win, no matter your tactics.
2) You're gonna die instantly in this game using tankrush. Rising sun's chopper, allies' vindicator and soviet's twinblade will destroy all your tanks (no matter the
number) in less than 30 seconds. The only choice for you to counter air force is to build airforce yourself or a number of anti-air units. Anti-air is divided to
vehicles and infantry, you shouldn't rely on infantry because they're easily crushed by tanks. And all anti-air airforce just is availaible a bit later, they're
vulnerable to anti-air vehicles themselves but magnificient to deal with other airforces.
3) You're gonna die instantly in this game using techrush. If you rush soon without building some forces to at least defend, your opponent would expand fast and
outweigh you in resources, which enables them to tech ultrafast, and you'll be finished in 10 minutes. If you tech without expanding, you'll not have enough to defend
expansions and will die the same way. And, the most fascinating about RA3, is that T3 units are not invincible, at all. They're just moving fortresses without ability
to anti-air, and the best choice to crush them, is to build airforce, but not to counter them by T3 units themselves (you can, in some cases, but it's not the best
way). You can tech to T3 and crush your opponent's buildings, but if you don't have enough resources (funded by expansions), you're not gonna get enough forces to
defend T3 units against enemy airforce (no T3 units is anti-air). Just 5 or 6 T3 units are not enough, they'll be crushed instantly - repeat, instantly - by airforces,
as the battle in RA3 happens ultrafast. 12 mirage tanks (T3) (24000 ores) of Allies will be crushed by 6 twinblades (T2) (6000 ores) of Soviet in less than 30 seconds.
This game is just perfectly balanced between airforces, navy and land, and if you don't advance really far into it, you'll not realize.