I enjoyed invasions in Beta, but there's one thing I didn't appreciate: after losing a POI and seeing the melding collapse on it, it just...opened up in a few hours. No interaction on our part, no re-opening the melding, it just moved back. I didn't see the point to that. It would have made more sense if we had to stage a 'counterinvasion' of sorts, dropping small melding repulsors outside town to open up a pocket big enough to let us reach the major repulsor inside and power it up before the mini-repulsors gave out, thus pushing the melding back en masse and allowing us to clear out the city of chosen...but I guess that day's passed.
The other thing I disliked about the melding was--you guessed it--retarded escort missions. The first time your VIP walks into the melding, you facepalm. The TENTH TIME? That's when you start blowing up the forums. I'm looking at you, Devil's Tusk.
It sounds as if we'll have a spiritual successor to the melding, so here's banking on the team understanding what was wrong with the original implementation.