The exchange rate of the Euro is probably too high for Southern Europe and too low for Northern Europe which makes exports from Southern Europe less competitive and exports from Northern Europe (particularly Germany and The Netherlands) highly competitive.
In order to reduce trade imbalances and even out economic growth Germany should leave the Eurozone and re-adopt the Mark but, of course, it won't.
By being in the Eurozone, Germany has the advantage of an undervalued currency, which is a factor in it being the second or third largest exporter in the world by value.
If the UK were In the Eurozone I would image our "status" would be similar to that of France, somewhere in the middle between Italy, Spain and Portugal on the one hand and Germany, The Netherlands and Belgium, on the other.