I like your idea but your evaluation of crucible seems a bit off at least when it comes to subclasses.
Y1:
In y1 blade & sun were the strongest subclasses together but bladedancer was above even sun due to arcbolt, blink + quickdraw, & the super was effective.
2.0:
After 2.0 dropped & before ttk sunsinger was the obvious best choice. From the time ttk dropped up till the sunbreaker nerf, sunbreaker was the strongest subclass with no equal.
2.1:
Without sunbreaker in the mix, sunsinger, stormcaller & nighstalker began to stand out. & since titans recieved some sizable buffs, striker & defender began to see more use.
2.3 (now):
Gunslinger hasn't been the hunter subclass of choice since the beta but seems really good compared to blade, bladedancer is dead unless you snipe or invis shotgun, nighstalker is still pretty effective if you like smoke & shadestep.
Stormcaller is pretty much the same, voidwalker is better than before unless you like blink, & sunsinger is significantly worse than the other warlock subclasses.
Defender is pretty good if you know how to make use of force barrier, striker has always been pretty good but now that tracking nades & roaming supers aren't so strong it'll stand out, sunbreaker is at the level it should've been when ttk launched.
English
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I would like to point out that sunsinger is the class I use most and I find the most effective stratagy to use with it is to grab the extended duration perk and armor perk and wreck havoc with the stickies using a pulse rifle to mid range and stock up a spare nadr at the end of the abilities duration or when you have less people to kill. In my personal use I have thrown and landed tons of sticky nades, mostly because I used the plasma nades in halo and semtex in codmw2, but to say the class is just too weak in my opinion is wrong, it just takes a small amount of planning ahead and proper use of the sticky grenades.