I don't get that just because they are in a different language means they aren't good. I mean... Next Time, Eiríkur Hauksson, Mor Vi Otesi and Sober. All good foreign bands.
Whatever language people speak, when they play music they all speak one language. It's good to hear some non-English songs sung in English but I feel if they were written in a certain language then they 'speak' better in that language. I mean 'Cwm Rhondda' just doesn't sound right if it's not sung in Welsh, for instance.
One of my favourite sounds is that of Gotan Project - a French-Cuban tango band. I'm also partial to a bit of banghra.