0 nic juices have the cleanest, purest flavor you can get. Nicotine actually mutes the real flavor of juices, not the other way around. They do however lack throat hit completely. Depending on the delivery system, what some may perceive as "bland" simply means that without the throat hit, you don't feel anything and feels like breathing air, relying just on flavor which again depending on what you use, might not be enough.
I almost exclusively vape 0 nic juices. I've used them on drippers, genesis, carto tanks, clearomizers, and the kayfun. On drippers and on the kayfun the flavor is off the charts, clean and crisp. Then follow carto tanks, then genesis and lastly clearomizers which do already mute flavor hard enough. I vape quite a variety of flavors, so my best recommendation would be that which you currently vape, just drop it to 0 nic on a decent setup to achieve good flavor. Remember that once nic is gone, all you have left is flavor and vapor production. There are some ways to simulate throat hit though. I'll say it again though, 0 nic juices pack the strongest *flavor*.