GM What's the deal with your engines?

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I bought my truck brand new in 2007, and I've never had such a bad experience with buying a new vehicle. I thought that GM Trucks were reliable and strong vehicles. That as long as I maintained it, oil change, good gas, tune up, that this engine would last me past the 200k mark...I would never had thought that at 138k the engine would throw me a curve. I've had the same problem as everybody else, with oil consumption on this engine and GM saying that it is normal for oil to burn on this engines, Specially since I've just found out that my LS has a 5.3 engine so I figured it's normal. I've also read somewhere online that GM while building this engines they didn't align the rings how they needed to be on the piston causing that famous burning oil. Which would make sense, oil slipping through rings= burning oil. But can anybody explain to me why at 138k I need to have my Tahoes engine rebuilt. I was driving to work, when my engine started sputtering and knocking, stabilitrak off, CEL ON, hooked up my machine to it and it gave me P0301, I took it to the mechanic, misfire on cylinder 1. Mechanic checked my spark plugs, wires, coils, everything OK, still the knock, then he hooked up the compression machine to check compression on the engine, and guess what!!!! NO COMPRESSION, he explained to me that is very common for GM engines to have this problem, and unfortunately his diagnose for my Tahoe was to have the engine rebuilt. WHAT!!!!! $3k to have it done, GM can you explain to me why I have to rebuild and engine at 138k, I knew that at some point I would have to do that, but at 138k come on, your consumers buy your product thinking that they have a quality USA product, I've had quite a few problems with my trucks as some as you guys know, in case you didn't here are a couple of threads I've started. http://www.tahoeyukonforum.com/forum...ad.php?t=21252 , http://www.tahoeyukonforum.com/forum...ad.php?t=21570 but this is just BS, yes, I know in this case I turn to our GM people and asked them what can you guys do for me in this case. Should an engine need a rebuild after it has been taken care of. And at 138k, any help would appreciated it.