This is obviously from an Spvp stand-point so we could just knock that out of the way right now. I wanted to go over Guardian as a whole and how it operates for both damage-output, sustain, mobility, cc access, ect and compare it to the rest of the cast. I've been wanting to do this for a while since I believe most if not all aspects of Guardian play revolves around actually thinking. What do I mean by this? Take a look.
-Sustain: When we talk about sustain for Guardian, we're looking at what keeps it alive, right? How does Guardian do this overall? It's heavily reliance on Aegis being the primary offender here. This forces a player into the Honor trait-line, even though it was nerfed, heavily. Never has there been so much emphasis on active play when comparing Aegis to anything else to sustain itself. While I love this, it's been VERY difficult to keep oneself alive with such play. Strong passives don't seem to exist here, even less-so with the significant nerfs as of late.
-Damage-output: When we look at damage-output, we not only have to look at how much damage is applied but also how it's applied. Guardians have notoriously had it difficult(from launch) at applying damage. Look at the tracking on every ranged weapon it has, look at how difficult it is to keep an enemy inside its main damage-source(symbols). Even if you look past at how difficult it is to apply said damage, the actual potential damage applied is even more pitiful. One would think that if something is difficult to, the action itself would be significant. Not the case here.
-Mobility: This one is rather simple. Anyone and their mothers could see Guardians mobility is and has been less than average. As a primarily melee-profession, one would think that decent speed would be applied but here, it is not. One aspect you could also take into account is the ability to stick on an opponent which would require solid speed or copious amounts of debilitating conditions which again, guardian does not have.
With all of this being said, It would be nice to get some insight from a developer as to why Guardian is designed this way. I can't understand it with nearly 9k hours played on it. Outside of all of this, I haven't even gone into the traits and skills but that's for another time.