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Hmm I usually take two myself (50/50 split) and once they're gone I don't have anywhere near the fast ML coverage I need so I get a massive drop in firepower. I have usually lost both formations by the end of turn 2 - it's unavoidable if I want to mark any target so I can start reducing the enemy formations.
IMO one of the things that causes the Tau to lose is trying to hurt the enemy too early.
Like Marine armies that first need to harry the enemy before committing their main force, turn 1 is often a waiting game for the Tau as they pull the enemy out of position. If they get over-eager and push forwards too soon they'll be mostly Doubling and won't be hitting the enemy strongly enough but will be left too close to the enemy in turn 2.
Plus, as Yme-Loc says, recon are such high priority targets that they'll rarely make it to the end of a game!
So, it's important to have some other mobile Markerlights available. Pathfinders and Skyrays attached to Mech. Fire Warrior formations are great for that
(Though the Skyray formation itself is quite over-priced IMO and isn't worth taking, as you're over-paying for their ML ability that gets to be split-up when you take them as single upgrades, and will only very rarely want to use when you're taking a Skysweep formation).