I think a few people are more disappointed that this gen of consoles still show a fair amount of aliasing..
The fact is that Forza 2 does have 2xAA in-game, it's just that isn't enough to completely dispel the aliasing effects at 720p for that type of subject.. even in the replays, Aliasing is present, and that's using 4xAA..
You really want 1080p + 2xAA to produce a nice 'smooth' look, but tbh that's too much of a stretch for the 360 and the PS3 unless we are talking graphically devoid game (Virtua Tennis for example)..
However, in context, the 360 is doing better then the PS3 when it comes to AA, Virtua Fighter 5 as an example, the developers are making noise about the 360 version having AA, with the PS3 having none..
Although the claims of free AA with the eDRAM are real, it sacrifices other effects, and largely developers are not taking up this option, however, clearly as a graphics system, eDRAM included, if developers can offer AA on the 360 in places the PS3 can't, I don't think we can criticise it too much..