The shaper section of Terminal Directive seems to have a bit of a theme of cards that become powerful based on free MU. Deep Data Mining seems intended to work in a deck built around that theme. Compared to The Maker's Eye it's more expensive by 1 and where The Maker's Eye has a fixed 2 extra accesses Deep Data Mining can get up to 4 extra accesses.
The idea of accessing 5 cards is enticing and given sufficient MU extenders and/or cloud breakers certainly achievable. Outside of a deck built around free MU Deep Data Mining is almost sure to be worse than The Maker's Eye.
It's a bit of a shame that Deep Data Mining costs 4 influence. It works great in many Sunny decks as Sunny's own breakers don't cost MU (since she has 2 link at start), so Sunny decks often run around with 4 free MU. Were Deep Data Mining any cheaper with regard to influence I'm sure it'd become an auto include in Sunny. At 4 influence it's still a good option, but one that will force hard deckbuilding choices.