no, does not work well
start by swapping left to right.. see if the issue changes or stays the same.
if it stays the same, then you know it is not the bulbs themselves, it is something in the wiring, sockets, or possibly grounding.
you mentioned the front one being dimmer so i would start there.. check the wiring over carefully, make sure there are no cracks in the wiring insulation, or rubbed spots.. refresh ground points at that location. make sure connectors look good, no melting or unusual wear.
generally speaking, flasher units do not fail like you are describing, they typically just dont flash any more on a given side, or sometimes both sides.