Calm yourself. Your request for further details is perfectly reasonable, but your outrage dilutes your stance.
To answer your question: Nearly every facility of the management interface is either incomplete or woefully underperforming compared to its competitors. But here are a few key points:
1) Snapshot management is atrocious. Snapshotting an active VM takes hours (!!!) and often fails, and existing snapshots are entirely linear, such that if I roll back to a snapshot, take a snapshot and roll back to where I started, the newest snapshot appears as "newest" which is not technically correct (compare this to VSphere's much better implementation of this)
2) The backend simply cannot handle replacing a machine if there is any remnant of the previous VM's directory structure, and without actually changing the base configuration (which means moving every VM file), you cannot handpick the directory paths. I had to create a VM 3 times over because of this.
3) The console has virtually none of the host configuration options present in an ESX implementation. E.g,, storage adapters, datastore management, alarm triggers, etc.
These are just a few reasons.