A couple points to remember: In the 3e Tau codex, all vehicles could field 4x Seeker Missiles. This was reduced to 2x Seekers in the 4e Tau Empire Codex. Imperial Armor 3 did not specify a number of seeker missiles, but was written to be playable with both the 3e and 4e codecii (Taros campaign came out before 4e Tau codex), and the historical 40k scenarios show one or two Seekers total, when there's the option to carry them. FW heavily modified a late v3 or v4.0 list to produce their Epic list (completely removing the unguided ability from Seekers, mind you), and yet did NOT make the Guided Missiles One Shot.
Now, Manticores have 4x missiles on the model, and are 2BP Slow Firing as a result. However, a Vulture has 2x Hellstrikes on the model, and each one is One Shot. It's not a big deal for someone that only fields one formation of Vultures to keep track of missiles fired, since they're probably going to alpha-strike and kill as much armor to lay BMs as possible before the Stormtroopers land and assault.
Now, the ML/GM interaction is one of the biggest differences between Tau and Eldar (yeah, eldar can Engage, too, but that's a different discussion). What it forces is fragile units to get close to the enemy so that the sledgehammer of Tau firepower can be brought to bear.
The currently accepted fix for the ML/GM issue is to require firing at lit targets only, add +1 to-hit for all Guided Missiles, and increase range to 90cm for ground-based GMs (45cm for air). This still requires some testing, but I believe that it will fix most of the issues. Yep, not having a marked target costs you a third or more of your AT firepower, and ML formations are either infantry or LVs for the most part, and always small, which makes them very fragile.
A couple quick comparisons: Leman Russ battle tank AV/20cm/4+RA sv/6+cc/4+ff Battle Cannon, 75cm AP4+/AT4+ Lascannon, 45cm, AT5+ 2x Heavy Bolter 30cm AP5+
Hammerhead (with currently discussed/accepted changes to GMs) AV/25cm Skimmer/4+sv/6+cc/5+ff Railgun, 75cm AP5+/AT3+ Seeker Missiles, 90cm AT5+ Guided Missiles Smart Missile System, 30cm AP5+ Ignore Cover
So, this means that a Russ has a reach of 115cm on the double and 95 on the advance, while an unsupported Hammerhead has a reach of 125cm on a double (since the Seekers CANNOT fire without a markerlight somewhere), and 100cm on an advance. Note that a Russ' danger range is 65cm (50cm for full effect of 2x AP5+, AP4+/AT4+ and AT5+) on an advance. The Hammerhead's danger range is 55cm, delivering an AP5+ and an AP5+/AT3+. Why am I not mentioning the Seeker shot? Because the Hammerhead doesn't have a Markerlight itself, and we're looking at this unsupported.
Let's assume that now some ML unit has survived to get within utter death range of the Russ (within the Russ' Engage range, in fact, since a ML is only 30cm). That means that a Hammerhead has a 140cm reach on the double, but with only one AT6 shot (waste of time with a 4+RA target, only a 1/48 chance of kill). At 125cm, the Hammerhead has an AP6+/AT4+ and the AT6+. Better, but still not a shot I want to take. On the advance, 115cm for a desultory seeker shot, 100 cm for full AT effect, and 55cm to add that AP5+ shot. Since Tau can't survive that close to an unbroken enemy, you can pretty much ignore that 55cm range, unless the Tau have dropped a co-fire on the LRuss company with 2x AMHC+Hammerheads+Skyray and a Tetra formation (which isn't necessarily good odds to break, either).
_________________ "For the Lion and the Emperor!"
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