The Met is technically still around. It is now called the EHL. It went through some restructuring and renaming a few years ago. The EHL has the regular division which is Tier 3 and the lower Premier division which is Jr B. I have no experience with Jr B, but from what hear, it is pretty bad these days. Obviously, the regular EHL division is better, 16/18AAA is better and I would say there are some 18AA teams that are better.
Here's how bad it can be. A friend of mine's kid was cut from a middle of the road 18aa team last season, but was able to make a Jr B team.
Also, Jr Flyers and Philly Revolution both stopped their Junior programs at the end of last season so their are fewer options in the area, which might be a good thing. Could make it less watered down.