Besides the MP for monitoring JEE (Java Enterprise Edition), it also offers the SCOM 2012 Sizing Helper. This is a good tool and I use it every time when I have to design a new OM12 environment or run a health check for an existing OM12 environment.
On itself nothing wrong here since it’s simply a good tool. And a long time ago – before I worked in IT – I learned this: Better is the enemy of good. In other words: when something is good and functional why replace it?