Stealth actually is fine. I even like when people run upto me in stealth. 'cos cloaked folk get 300% dmg or so. And 'cos im running always (!) with nanovision... Well... They die a lot
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Even if a camper is in stealth, you can easily kill him, never had the problem of losing to stealthed folk.
So - either go nanovision. Or just learn to see stealth (you can see it with practice).
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Stealth by the way was nerfed. It was nerfed when mobility enhance was made useless. Before the nerf - i could run from the Lighthouse to the ruins in The lighthosue map - on one charge. Now - i need 3 charges.
And crysis isnt the type of game in which camping is really apreciated. Only 'bout 10% of the snipers i've seen have gotten good K/D's . Others, even with the stealth and sniper power - svcked pretty hard.
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So the point is - Stealth is easily counterable, by well - everything. And you shouldnt have a problem with it after 2 weeks of gameplay.
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'Bout the campers - if you have issues with campers - just flank them. And stealth kill. Or - there are other areas of the map in which you can run in circles killing people.