The only thing I consider TOO strong about the current flamer is the ignition chance. An unsprayed component will suffer extreme amounts of fire stacks in zero time, an unsprayed ship will just be set ablaze and quickly burn out.
I'm all for a change of meta- I had huge amounts of fun playing today both using the flamer and facing it. It's not 'uncounterable', in the sense that with an average crew we were still able to survive encounters and get kills safely versus ships utilizing a flamer+something combination. It adds tension and changes the way engineering is done (different priorities, more varied loadouts depending on enemy guns etc). However I'm certain that it would be literally impossible to stand a chance against such a combination when fighting on a ship with spread-out components such as the mobula or the spire, and in any way the gun is far too punishing to inexperienced/uncoordinated crews.
I'm in for keeping the flamethrower a viable alternative to the previous meta but it would still have to be tweaked. Wundsalz's suggestions of strongly nerfing the flamer would result in it being once again turned into a low-tier gun that's only used on casual games or in very specific loadouts to disrupt enemy repairs and prolong fights. I think we should instead embrace change and see how allowing the gun to renew the meta could actually refresh tactics and gameplay.
There's a lot of ways the gun can be changed without being thrown into the pit again;
-Reduce the ignition chance to half but not any less
-Keep the ignition as is but at least have it do no damage by itself
-Reduce the range
-Reduce the rate of fire
edit:
or just completely rebalance it and turn it into a medium gun :fire::fire: