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....it may be heavy, but yes it is strong and cheap.
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MDF does not have particularly good bending strength... so keep the spans as short as possible and keep the loads as close to the supports as possible.
Recall from college Statics class that beam deflection varies with the cube of span, so every 25% increase in span doubles the deflection. Trust me, if you make the shelves 50" long, say, to accomodate a large TV and then put a stack of heavy components in the middle of one, it will bow big time --and get worse with humidity and temperature cycles.
Supporting the shelves along the back with a sturdy rear panel helps this considerably. Alternatively, you can put a hardwood rail along the front.