But if you're going to ignore what the system requirements actually say I'm not obligated to nod and agree with you.
System requirements are not always accurate; companies are sometimes more concerned with shipping copies than releasing precise requirements. I value real-world results more; I've been that way ever since I started gaming on DOS and struggling with performance on a 486/33MHz machine. (Recommended: 486/66MHz!)
Do you really want to blame the user for being a sucker when they see requirements like this from the Steam store listing:
Processor: Intel® Core™2 Duo (Intel Core i7 recommended)
Graphics: 512 MB video card (see supported list*)
*Supported Video Cards at Time of Release:
NVIDIA® GeForce® GT 8800 series or higher
ATI® Radeon® HD 2600 series or higher
Notebook versions of these cards may work but are NOT supported. These chipsets are the only ones that will run this game
There's a huge gulf between Core 2 Duo and Core i7 that rings alarm bells; there's also a bit of bait-and-switch that AMD, NVidia and Apple engages in by passing mobile graphics chips as desktop-class, or comparable in performance to desktop-class. (There's plenty of threads here on Macrumors alone where people try to figure out if their iMac graphics chip is desktop or mobile, for instance. I still have no idea if my ATI Radeon HD 4670 is desktop or mobile-in-disguise.)
I think you're being overly scornful of your fellow gamers, who just want to play the game and are disappointed when they can't (or think they can't) for whatever reason. Snarking at them for not reading the system requirements and challenging them to see if they can do a better job porting PC games to Mac is a bit too much.
EDIT: Splinter Cell: Conviction looks to be a native port the way Assassin's Creed II was a native port. (See
here. A few posts down, someone notes that AS2 has multichannel sound support, which can't be replicated by WINE and its brethren.)