I disagree about Cujo, and it’s replaced Mimic in my Noise deck with nary a regret.
With Noise I find the most irksome sentries to be Komainu and Tsurugi, I want them rezzed, but I don’t want to eat their subs when I do (in case they trash my parasites/deja vus/etc…). This is before I am fully set up and have Grimoire + Clone Chip + Datsucker counters. With Mimic breaking those many subroutines is a hassle and the credit loss sets me back almost as much as losing the cards would. In this regard Cujo is far superior, and I can pawn it happily when emptied. When dealing with mid range sentries like Architect or Caduceus Cujo is slightly inferior, a defect that can be rectified with Datasuckers. AND it gives the flexibility to deal with large / str 4 sentries should the need arise.
As a long term killer? Worse than Mimic. Sure. As a short term safety net to face check sentries so I can get my parasites on them? Better than Mimic.