The MetaTrader volume you see is probably tick volume rather than actual traded volume. That makes it somewhat less valuable. The only real source of traded volume that is publicly available comes from the futures exchanges.
Volume information can absolutely be put to good use. It's not something you would use by itself, but it can be very handing as a confirmation (or non-confirmation) of price action. For example, a market rallying on stronger than usual volume is a positive. So to is a low volume decline, which generally indicates a lack of selling conviction.
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