Light rain is always a tricky one. I have an IMC Rating or IR(R) as it is called now, and light rain is fine if as described earlier. If you can see through it, or you can go around it, then you have options. What I would personally consider is the weather around me and associated with it.
For example does the forecast show light rain and low visibility, or does it have a PROB TSRA and or CB's somewhere in the area. Does one of the nice websites / apps show lightning strikes or other serious activity.
The other thing is that landing in rain is harder as you have no windscreen wipers, and only a quick flick of the throttle might clear the water off your screen. It might require you look more out of the side of the window to judge your height to flare as the rain could distort the vision. And of course no one really wants to get soaked doing pre-checks or tying the plane down. So, you can fly in rain, but there are some additional things to think about.