Sir I think you need to go to rehab like ASAP. The drugs are really affecting your brain. I would hate to see someone as smart and intelligent as you never post on these forums again! :(
I used to feel this way about the Colossus, especially since its utility against Zerg units is so high. However, then I was persuaded to play Protoss for a while (my NA account was my "mess around" Protoss account), and I quickly changed my mind.
To get Colossi requires quite a bit of resource management. The unit itself is cumbersome, expensive, and cannot travel anywhere without support since, despite being 300 minerals and 200 gas on legs, it can even be taken down by Zerglings if they get a surround. They are eminently "snipe-able" with Corruptors - for instance if they are positioned on a ledge or away from other units (or are en route to the deathball), and the loss of a few of them sets a player back enormously.
So while I sympathise with your feeling, I have to say, no, I think it is a serviceable unit and absolutely essential for Protoss to deal with massed enemy biological units.
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