3/1s are usually unplayable (they're not efficient for getting agenda points and dilute your deck with agendas). The 3/1 agendas that get played either need either a great ability or an excellent interaction with a popular ID(s) to work. AR-Enhanced Security has both.
AR-Enhanced Security's ability is thoroughly excellent. It's a straight improvement on Controlling the Message's ID ability, which has been among the strongest corp IDs for years. CTM traces for a tag if an installed card is trashed. With ARES, a tag always hits (no trace) even if the trashed card isn't installed, making it better against Stargate and HQ/RND destruction. Along with CTM's ability, this is one of the most reliable effects to jack up the price of trashing assets so high that many decks can't keep up.
Runners right now have a slew of options for dealing with trash costs (e.g. Miss Bones) or bypassing trash costs altogether (e.g. Stargate and Imp). AR-Enhanced Security is a major reason that asset-centric decks are still an option out of NBN, though not as strong as in years past.
Your first ARES scored will probably inflict 3+ tags for a direct impact of 9+ credits. In addition, there are uncountable benefits like the cards NOT trashed and the runs not made because the runner is afraid. If your deck gets any value out of tags, there will be many situations where scoring this is a good use of your time, even though it does make deck composition clunkier compared to 3/2s and 5/3s. There will also be games where this lands the winning tag(s) and plays a crucial role winning on tags. As far as tag-dealing cards go, this is more reliable than most.