Actually, Avira is not bad at all. It has no zero-day capabilities maybe but it has very good Heuristic and signatures than other free AVs. Maybe Avira Free has the best signatures on the free market area. PUP/PUA detections are great on this product. If a file is unknown by APC..the Avira Free uploads the file to cloud (only executable files uploaded, good for privacy) The cloud analyze takes 10 seconds and results come. It will be good or bad.
Avira products are decent antivirus with its Avira Protection Cloud. It needs zero knowledge and configuration.
In my opinion, Avira is the best free antivirus. These are my latest experiences on latest Avira Free build.
On surfing web, Avira Launcher offers Avira Browser Security and it is not bad on malicious-phishing URL blocking.