BADRAP: I am truly sorry to hear that they couldn't/wouldn't fix your H2, but if I were you, I wouldn't mess around with this dealer any more. You had a list of over 20 items and they only addressed 5 of them and then told you "that's as good as it will get"?
Make sure you get everything in writing and keep very meticulous and very detailed records, not only the actual service records, but also every time you talk to them, who you talked to and what was said. If they cannot reproduce a problem, make sure that your paperwork lists the problem with along with whatever comment from them...not fixed, unable to reproduce, whatever. This will help protect you later on down the line.
When the brake problems first surfaced on my H2, the dealer was "unable to reproduce" and blamed it on "vehicle size, tire size and road conditions." But amazingly, later on down the line, they did in fact have to do some repairs on my brake system. I can't tell you how many times they said my severe roof rattle was due to the roof rack, either that or they were "unable to reproduce". I told them every time it was NOT the roof rack causing it, even went so far as to have them remove the roof rack altogether to prove it (during which process they also ended up chipping my paint, but that's another story). Of course many months on down the line a different dealer found what was causing my roof rattle right away...loose A pillars/moldings. Had a "SERVICE 4WD" issue, they essentially said it was "operator error", because I wasn't "operating it properly", but amazingly once again, later on down the line they ended up finding transfer case problems. I could go on and on...
But just don't feel too bad about your H2 being in the shop for 15 days though...it could be worse. At last post my H2 had been in for a total of 58 days. Took it back in a couple of weeks ago and I still don't have it back yet, so add yet another couple of weeks to that 58 days now...and the really sad part is that I haven't even had my H2 for a year yet.
No one should have to put up with problems like this on a brand new vehicle, and not even first year models should have these kinds of problems. But, it's not an easy thing to ask GM/Hummer to buy it back or replace it...not even with over 70 days in the shop within the first year of ownership, for problems including not just rattles, but some
major safety issues. Just keep very, very, VERY good records, and if the other dealer offers to make the first dealer's and/or GM/Hummer's mistakes right, I would probably consider taking them up on the offer...because believe me, it's a lot easier than trying to fight General Motors. Just make sure that you don't lose any money on the deal. After all, the H2 belongs to you, but the problems belong to GM/Hummer. You bought your H2 in good faith, expect nothing but good faith in return.