IMO I think as stamina based melee Nightblades, we should head more into the direction of an 'Infiltrator' archetype compared to a 'thief/rogue' archetype. For example, out of the 4 classes we are the only one that have a class ability to cloak. Granted it's still buggy/broken ATM but I'll talk more about that later. So I feel like as NBs, we should more CCs both in and out of stealth. Like in WoW, sorry I mentioned WoW but it has a good archetype build already, Rogues moved away from the 'Ambush from stealth and OMGWTFBBQPWN'd you with constant backstabs' playstyle and more into a kill potential setup.
This does 2 things. 1) In PvP, NBs will beable to stealthly disable backliners likes archers/mages/healers. But disable as in soft CCs like a silence or just plain old 'Sapped' in an unactable state/stasis for X secs subjected to stamina CC break and diminishing returns etc. 2) In PvE, for both grouped and solo settings, you can go in stealthed and disable a backliner mob. Not only will this make NBs more wanted but will also make NBs have more combat longevity. Medium armor can't really tank so why tank damage if you can negate the damage via CCs.
I havn't really thought about what/which CCs are to be proposed but something like a stealthed silence, sap, combat stun (w/o the need of a Cloak+CW combo), and maybe something like a smokebomb (AoE untargetable, group friendly within X radius).
Of course, what I am proposing is more of a class overhaul then a fix so this will sound a little crazy/OP etc.
Touching base on Cloak, I seriously believe that ESO needs a stealth mechanic overhaul. Armor should/will have an effect on stealth (crouch). For example, per heavy armor pieces is -5% crouch efficiency. Light armor should be neutral with a 0% per piece to affect stealth. And medium armor should be +5% per piece crouch efficiency. And overall, the detection radius needs to be significantly bigger. I believe that crouch should still be available to everyone but it's efficiency needs to be in checked. It's a bit crazy that a whole zerg group can be about 15/20 meters away from you and still remain unseen. IMO this breaks game immersion.
Also as a NB, we don't really 'benefit" from stealth considering everyone can stealth and everyone can detect. Which is fine in sense. I believe that you should be able to detect stealth but more in the line of Detect Life vs Illusionary Skill. Stealth is an illusionary skill. I don't see how simply walking in the same vicinity you can 'detect' me without any additional efforts. And by 'Detect Life' I mean simple means like detect stealth pots (which are OP btw. I love using them vs other NBs

) and Magelight.
On the subject of Magelight, I wrote another thread about this but I'm going to summarize it here. Basically, the unmorphed version of this ability should not beable to detect life/stealth. I believe that you should either spec into utility or damage. For example, our Concealed Weapon vs Surprised Attack. You can get the -40% armor pen (damage) OR the increased stealth movement (utility). Magelight ATM gives BOTH morphs stealth detect (utility) AND spell crit (damage). Only difference is one gives more crit or stealth damage reduction per respected morphs. Basically the same thing on what SnB users are asking for which is SnB to be on par with other weapons (lolz). How does using a single sword should be on par with a 2H or a guy using 2(!) swords/daggers. But I digress.
What I am proposing is base Magelight is just the +10% spell crit, which in itself is still a ridiculous amount of crit. I wish there was a spell that added +10% crit to weapon

. The morphs should be -stealth damage AND stealth detection OR only the +17% spell crit. This way you can't just have an anti-NB I WIN button, you'll have to choose.
Nightblades need a niche that no other classes can provide. I believe that niche should be a more powerful stealth, undetectable unless you actually put efforts into sniffing us out and more in and out CCs. The 'single DPS burst' archetype has been taken by Sorcs and I doubt they'll give that up with the current meta.
For a wish list, I wish they would added innate/passives for dodge/parry but I think that'll happened.
I'm pretty sure there's more for me to rant about but I can't think of anything else ATM.
Thoughts?
/End Rant