If something was dropped on the unit and it shattered then their offer is generous.

If it shattered all on it's own then they are dodging their responsibility and I would raise a stink.

I am a Canadian so do not know where you should report this to.
A little research on the net should help you find the correct government organizations.
Perhaps someone else will jump in with the proper organizations.
Or you may want to start a new thread asking for where to report this.
A top that shatters on its own is a very dangerous situation!!!

Lets say it shattered with a pot of boiling water on the stove, anyone near the stove could be scalded. God forbid that the person is a small child.
Or hot fat which could end up burning down a home.

Who knows they may have a bunch of defective tops out there and you will be doing others a service by pursuing this, perhaps even saving lives.
I would report it even if Whirlpool does agree to cover the full cost.

Here are your parts
Replacement parts for MAYTAG MER5765RAW Range - S/c F/s Ele | AppliancePartsPros.com

Here is the tech sheet which may come in handy in the future
http://www.servicematters.com/maytag_library/docs/16027247.pdf

Here is a manual which should help with the replacement.
http://www.servicematters.com/maytag_library/docs/16025644.pdf

I am assuming it was a used stove or that something was dropped onto the top.

If the stove was new and the top shattered on it's own then get it replaced under warranty.