I'm gonna start off by saying, most of these are ideas are not mine, however they are interesting enough I felt they should be included.
So, as we all know SE has seriously messed up Mch, again, but rather than just complaining about it I thought I'd throw a few idea out there on how to fix the class, along with giving it it's own identity which it sorely lacks right now, and make it all around more interesting.
I've been playing Mch since it's release in 3.0, and I do love the job, but as it stands right now, it's useless. We don't bring enough utility or damage to the table at any point weather it be when we're trying to burst, or just overall dps. However, that doesn't have to be Mch's role in the raid. Personally I always felt like Mch was leaning more towards the role of the Debuffer, a type of support character that specialized in weakening the enemies defenses. This would keep it within SE's idea of ranged support while still giving Mch an identity all it's own.
So with that in mind, here are the changes I think would seriously help the class:
1) Undo the changes made to heat management in 4.05. These changes were just horrible. However, as I stated this is not about complaining but offering ideas, so rather than reducing the heat skills produce to make it easier for new players to adjust to the heat system, reduce the amount of heat needed for Shot Mastery, 40% should be ideal. However, I believe that CoolDown should be kept at 50%, this would keep the ideal balance between 50-95% heat going, while making it easier to work with some minor mistakes.
2) Hotshot: So putting Hotshot at 8% is a step in the right direction, though not far enough if you ask me, however I am going to purpose an alternate idea. Add a ground based AOE dot to Hotshot, while keeping it's damage bonus. Now if this is done, I would expect to see Hotshot's damage bonus reduced back down to 5%, however this would make the ability less of an ability bloat, and something more interesting. I know Bard use to have Flame Arrow which did the ground AOE and it was removed, however I believe the idea fits better with Mch, seriously you shoot a bullet or use a gadget that catches the ground on fire, that just screams Mch.
3) Fix Flamethrower...... Ok there have been a number of ideas thrown out on how to fix Flamethrower so I'm gonna give two ideas on this. One that is likely to happen, and one that I would like to see happen as it would be more interesting. The first one is simple, buff the potency on Flamethrower, obvious fix I know. However I did say I was going to give two ideas here, and the second one is far more interesting. The second idea is rather than buffing the potency on Flamethrower, have it give a stacking debuff, something along the lines of a 1% vulnerability per tick for 5 seconds, stacking up to 10 for a total of 10% vulnerability for 5 seconds. This would make sense, as your using a Flamethrower, and it would allow mch to bring more utility to a raid group.
4) Increase the duration of Dismantle. So as it stand Dismantle has a duration of 3 seconds, obviously this was meant to weaken one big attack, however with a duration of 3 seconds if your lagging it's useless, if the wind-up of the attack is longer than anticipated it's useless, if your even half a second late on pressing that button it's useless. What I'm saying is that a 3 second duration makes it useless, now it doesn't need to be increased by a lot, but enough, maybe like to 5 or 8 seconds
5) Allow turret auto-attack and Overload to affect Wildfire, or at least allow Overload to affect Wildfire. It seriously doesn't make sense to me that it doesn't work this way, it's the mch's turret, your blowing it up, this should add to Wildfire, but it doesn't. Myself, and many other's, really enjoyed the Mildfire-Wildfire dynamic that Mch had, and now it's just not there. This would bring that back, while helping to fix the biggest problem Mch has right now, and that is just damage. Simply put Mch doesn't have enough of it.
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Adding in Everyone's ideas here. There will be some changes and editing in order to save space.