
As a new player and play through each campaign from the beginning without T list, I would say before Fingerprint Kit is accessible, Dr. Milan just boost the price-performance ratio of one investigating action for a seeker. Just compare Deduction and Vicious Blow, it shows that 1 clue has the same value of 1 damage. But comparing Seekers and Guardians, while they are both doing their duties (seeking and guarding), what can a seeker (Rex away!) get while a Guardian has dealt 2 damage and earned 1 card with 2 actions and nothing else paid (.45 Automatic in play) ? Only 2 clues and nothing! And what if seekers have Milan in play like .45? For 2 actions, seekers can get 2 clues + 2 resources, which is finally equals to 2 damage + 1 card. Dr. Milan in the early campaigns is not that broken.
Edit: Simply thinking, are you willing to change Beat Cop's trigger ability into 'Attack. After you successfully attack: Gain 1 resource.'. It's definitely better than Beat Cop (0), but considering its upgrade and all the weapons, the answer may be yes, but never will be absolutely yes.