What is the purpose of the storage beneath an oven? In most instances, it seems people use these to store cooking sheets, extra pans, and sometimes lids. However, most (all that I have used) of these storage compartments have terrible tracks and don't seem to support holding heavier items without a lot of strain. 

Is there an intended manufacturer use for this storage? If there is no intended use, is there a reason manufacturers neglect making them sturdy (other than the obvious: cost savings)?
Most of the oven drawers are for storage; and in my experience it is always badly implemented (like you, it never work well)

Some oven have warming drawer to keep food warm (check your specific oven).