I have a huge problem displaying the austrian Basemap.at WMTS Service in QGIS 2.4. When I add the service, qgis logs multiple errors on failed tile requests. When I zoom into the map, it is displayed in a very poor quality (see screenshot).
I really don't know how to fix this problem - can anyone tell me how to increase the quality of the tiles?
WMTS URL: http://maps.wien.gv.at/basemap/1.0.0/WMTSCapabilities.xml
UPDATE 1:
I tried setting the resampling methods in QGIS to Cubic/Average, as you guys advised me to and compared the result with the same zoomlevel in ArcGIS. In this screenshot you can see the result: At the same scale level QGIS just skips an entire tile level, whereas arcgis loads this level correctly. - Any other ideas? 
Answer
After some experiments I found out that the core of this problem is related to the predefined scale levels QGIS uses. Through the slider provided at View > Panels > Tile Scales I could gather more information about the WMTS-Scale Levels the Basemap.at WMTS scales at. As a next step i went to Settings > Options > Map Tools and replaced the scales which are defined as default with the Basemap.at scale-values through the following XML-code:
When you now reload the map, the quality of the map will be outstanding!
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