Germany is a world class wine producing country, make no mistake of that, but it's reputation has always been divided among British drinkers. For many decades, sweet lower quality brands flooded the mass market and consequently unfairly tarnished the view of Riesling and also Germany in general. However things have changed, and now many people are starting to experience just how good Germany really is, especially the dry Riesling from top producers, which is more appealing to the UK palate. They do still make many sweet wines, though these are normally very prestigious and not easily found in general markets.
It's actually fairly common for young winemakers around the world to learnt their craft in Germany: an exposure to a hard climate, unusual grapes, and outstanding technical and horticultural knowledge. Germany is changing, and many modern quality dry style wines can be found to enjoy.