Like I said, it's not because the MiG-29 is better, it's because it's flexible. As a multirole, it can be kitted out for anything from air interception to ground attack. However, it lacks the traits that make planes specially made for those purposes, such as the MiG-25's speed and the Su-25's low speed stability and high number of hardpoints. It only seems better right now because the RP hasn't started yet and I imagine most want to play it safe. 

I imagine that there will be a lot of times during this RP when I go 'Gee, I sorta wish I picked the Su-25/MiG-25.' XD