I understand what you were trying to say, John. I just prefer to avoid "negative" words as it gives the impression that can allow the creative juices of onlookers to make biased or presumptuous remarks. Really it comes down to understanding what you've got to work with, and what you require to enjoy the content.
A shared (or "virtual") graphics processor that splits process time with the system RAM and system CPU, will not outperform the more modern graphics cards that are available in Macs like the MacBook Pro, Mac Pro or iMac. It's just not how the technology works, it has nothing to do with the machine.
The X3100 is definitely a noticeable upgrade in terms of shaders and glow effects in many games, even games that ran on the 950. But as John stated, at the end of the day, if you want to get serious with gaming on computers then a dedicated graphic cards is rapidly approaching the point of "you must be this high to ride."
Tiger Woods PGA Tour '07 (and '08) are fantastic games, with absolutely amazing real-to-life animations in both the environment and on the players. Animations, shaders and effects that onboard processors like the GMA 950 and X3100 are not ideally designed to process without some extra hard work.
Unfortunately, to most people, many of my family members include, they consider a game like TW PGA Tour to be "casual" but as game developers continue to ride the line between realism/simulation, it's only going to be harder for the hardware manufacturers to make sure we all get to enjoy the fun at multiple price points.