The performance of the previous versions could be better. We encountered certain issues with the lower version of it, the 9.2. Things have greatly stabilized since then. However, as with any IBM tool, things are a bit tricky. I would give a rating of four or five out of ten, as we encountered certain issues with the domain controller with the lower versions. 

It would be nice if we could get support for earlier versions. Generally speaking, IBM insists that we move on to their latest one. 

In respect of the dependency diagrams, the job dependencies across the business process should be improved. 

This solution does have bugs and could be improved in this regard. However, these bugs are resolved relatively quickly. 

There should be more custom documentation, specifically around Java APIs. There should also be more training.

In terms of features, we are currently using only 50% of its features. We don't use all features that are available, but there is always room for improvement in all of the tools.