"...because it's supposed to be so much better..."
That's relative! In normal use (like me: mailing, some browsing and using viigo) the advantages aren't so much
Ok, it's faster but is it so much time to wait 3-5 sec. longer to load a page? Another thing, your charge will go faster down on 3G. In my opinion another problem is, you have not a full supply when you aren't in a metropolitan area. And so your device is switching back to EDGE. Check your location for this.
Otherwise I see 3G should be the better next-gen-network.