I think I have to nominate a vehicle from a rather new game, Wargames: European Escalation.
It's an "upgrade" to an anti-air gun jeep, which is ok, but really nothing special in itself, for the price it costs.
Its name? The Strop 1
Let's go through it's failures!
-It can only go, in optimal conditions 200km on a single tank of gas. It may sound like a lot, but you have to divide it by 5 to get the actual performance. It is in fact the vehicle with the least autonomy in the game, all that with a rather large fuel tank, 500L, which is enormous for such a small and cheap vehicle.
It's not even very fast.
-Its armed with an inaccurate anti-air 30mm auto-cannon. It doesn't have enough range to hit helicopters using missiles or rockets. Even if it manages to get in range, it fires too slowly, and takes too long to start hitting the target before it either leaves, or destroy the strop 1.
-Its price is appalling: 40. With that kind of money, you can buy a much more efficient missile launching, faster vehicle with twice the range.
-Its armor? 1 in the front of the vehicle, 0 everywhere else. Infantry can hurt it by using only rifles.
-Its health pool? Barely more than an armed (armed, not armored) truck, for two and a half the price.
The worse part of this vehicle? Its successor is truly amazing. For 25% more money, you can get much more speed, 3 times more autonomy, an accurate missile launcher, a more accurate main gun, more hp.
If you see one of these vehicles on the battlefield, you know your opponent so so desperate/incompetent, you can win just by having a single infantryman walk up to his units and kill them using only a rolled up newspaper.