You're mixing 2 issues here, a "no sound" bug with a "some files don't play" issue.
Both caused by Lion upgrades. That's the point.
KnightWRX said:The "some files don't play" is probably just a case of missing codecs, especially if they play in VLC. Quicktime never was quite up to snuff here as Apple doesn't really see the benefit of the open source codecs mostly.
Or it could be caused by a conflict with a shared component in the OS core, which Quicktime shares. Who's to say? VLC has its own core.
KnightWRX said:The no sound thing after battery drains, etc.. are bugs and should be reported to Apple.
Also, your trackpad seems to be having hardware issues rather than Lion issues. I have no problems with gestures or other trackpad related events under Lion on my 2010 MBA.
Nor do I have anymore beachballs than I did with Snow Leopard (anyway, the only beachballs I ever get are when doing file transfers over the network with Finder, and I've had those since Leopard, so hardly a "OS" related issue, this is purely because Finder always sucked and still does).
Also, my C2D machine is not sluggish at all, nor have I had battery issues moving up to Lion.
The only "issue" I have had that you say is the "instant-on" issue, but frankly, it's barely slower than SL was (the MBA never was "instant-on" to begin with after going to deep sleep and for normal sleep, it's as instant-on as any Mac I've ever seen, quite the marketing gimmick Apple pulled there).
I had my suspicions about the 2011 Airs being better than the 2010 models, and having them side-by-side (albeit 11.6" vs 13.3") I'd say I still like the older model better running OS10.6. And I'm in no hurry to load it up with Lion after my initial experiences with it on the newer machine.
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That's not a bug. If anything, it's a feature.
Maybe for you. Not for me.