Gametrailers or rather SpikeTV is going to air the first DMC4 review on GTTV this Sunday. But if you don't have spikeTV you can just watch it online at gametrailers.com. they say the show is on at 1am so i guess that is when it will be online too.

So far they the other games have scored pretty high and the users give DMC4 9.3 right now.  Here is what the other games have scored:

DMC3: Dante’s Awakening 9.0 by GT/ 9.4 by users

DMC3: SE 8.0 by GT/9.3 by users

DMC2 no GT rating but users give it 8.4