In terms of "the mold" of steroid, one of the interesting things from that report was that Arod was using a steroid that added "lean muscle", but didn't add bulk. Apparently, it's a more expensive steroid, and it's harder to detect through testing.
The importance of that is people using that particular steroid don't "look" like a "steroid user", because they're not huge hulks of muscle like McGuire. That's probably one of the reasons why people gave A-rod a pass: he doesn't necessarily look like a tank, but rather just like a guy who lifts in the off-season (kind of like Nomar, who very well may have been using.)