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Battlesuits are nice and all, but they aren't the defining feature of a Mech Tau army. The required element for Mechanized armies is that all your troops be mounted in transports. This gives them protection against assaults that a gunline simply does not have. Furthermore, it lets them run up, pile out the back/side of thier transports and be out of assault range while in Rapid-Fire range; putting your fire where you need it most. And of course, the most important fact about a Mech army, is that those transports give you the mobility to claim objectives at the last minute, something footslogging Tau would have a hard time doing.

Oh, and your ranges gripe is nonsensical. First off, your Firewarriors on have a 30" range, not a 36". Secondly, it's battlesuits that have access to the only 36" range weapon in the Tau armory. And lastly, if you're playing on a standard sized table, you're deploying 24" away from each other anyway. Getting inside 24" is as simple as a turn one move.

If there is no terrain, then good luck. Impguard will do that same thing you do, but the problem is that they have the battle cannons and the earthshakers, which have a far more powerful ordenance blast than a Railgun-submunition, so they would do far more damage. sweatdrop
You have to look at all of the possibilities. Yes, your idea may work for an army that does not have very good range and heavy, but once an enemy gains speed and strength, then you have a problem. sweatdrop

1. Infiltrate
2. Use cover
3. JSJ
4. take ml just in case you find a position to missile out that Whirlwind or Basilisk sitting behind building or hill and fearing nothing from railguns

i hate tau i was using my space marines by the time i got to the tau 3 quarters of my troops were killed and then sent in the bug allies and killed my remaining men

Rules state, and i'm not quoting, that a seeker missle does not need a line of sight (It pretty much goes around buildings and other obstacles, like a smart missle, hence the name "Seeker missle").
It also has no distance limits. As long as a marker light disignates a missle lock from any where accessable, then a seeker missle can be fired, but it hits on the side that the tank is facing. If the missle is fired from a Sky ray and the ray is facing the side of a tank from across the map, then the missle hits the side of that tank. 3nodding

As for the suits, thanks. I don't know what it is to see them, though. Is it 3D6 or 2D6?
I have no idea and I don't feel like looking in my codex. mrgreen

I think he missed the part about the Stealths Marking the Basilisk. However, it is pretty difficult to infiltrate into a position from where you can see the Basilisk while still obeying the restrictions on Infiltrate. Seeing Stealths is (3d6)x2. Not nearly as much protection as I'd like.

Uh, no. It says they are hiding, out of LOS, and thus fear no railguns. That's the point of using Seeker Missiles; because he's hiding, and thus can't be hit by direct fire weapons like Railguns.