Poor Camera Performance problem with my LG Nexus 5

Hi. My LG Nexus 5 Smartphone is facing some issues on its camera. Nowadays, Smartphones are known to have great features in all aspects. But my phone's camera is showing poor resolution and my pictures are usually blurred. It even has a slow auto-focus and shutter lag. I want to know if this is a normal issue with Nexus 5 or if not, what can I do to resolve this?
