A lot of people are posting about how the ARC dexterity costs too much and doesn't perform for the cost and various other suggestions for buffs, I'd like to ask these people (and anyone interested) to come and play some moviebattles 2 with me sometime, I'll demonstrate what exactly a good ARC can do, especially with wallruns, lunge & wallflips.
Honestly though at this point I'd recommend leaving ARC alone entirely, the dexterity system atm is already better than auto-roll for skilled players. The class is nearly perfectly balanced, it requires skill & timing to play well versus good gunners & sith I play practically nothing else in MB2 and I've gotta say, it feels unique and competitive as is. For sure, no further buffs are required, if anything I'd recommend increasing the damage on lightning vs ARC, it's a pain to counter a good ARC, I know from experience on EU servers, BG servers & various other servers that when I play ARC, most of the sith & even gunner players get very annoyed very quickly and being fair, enough of this modest shite, I'm probably the best ARC EU and often end up carrying my team to victory in 1v4s or more, as arrogant as it may sound, it happens on every server I play unless I've taken a break from MB2.
The largest factor to ARC play atm is positioning & timing, I think the class is perfect as is in its role as a mobile gunner with heavy armor to back it up, it's limited on ammo and can be worn down through constant attack (stamina) but a good player can carry through all, I'd say if anything what should be done is grenades should be made cheaper to encourage more EMP-related ARC play and then I'd also recommend having a look at the hero class, snipers shouldn't be able to dodge as much as the hero/bh do at the moment, in my opinion.