I like it. A mini boost to the marines is just what we needed. A good marine team could still beat a bad alien team... it was just much harder than it should be. Maybe this will fix things up.
On the topic of PG's, my favorite trick as an alien only works if you have help. There's almost no way that 2 or 3 skulks can take down a PG before the rines pour through, even if it's totally undefended. A competent comm has already beaconed, and the rines are just grabbing 1 or 2 rounds of ammo before flooding into your hive.
So while your friends frantically hit the phase, you climb up the wall. PG's are almost always near a wall or some structure. I hold down bite and aim at the center space above the PG, where the marines will be materializing. Sometimes the comm drops a PG out in the open, in which case I actually jump in place while constantly biting.
This way, as fast as they come through, you bite them at head level, usually even while you're actually a little higher. If they knew skulks were there, 99% of the time they'll be aiming down as they phase. Phasing is disorenting in itself, but getting whacked for 70 damage on top of it makes for easy frags. Not to mention, the PG model itself seems to give some cover at ground level (aka skulk level) for anyone teleporting through.
The last time I did this, it was a phasegate built by a JP'er inside Powersilo hive. I racked up eight frags in a row on W3/A2/JP rines by preemtivley biting everyone who came through while a pair of other skulks hit the PG itself. The disorentation and ambush bite really throw them off, and in that case, saved us the game.