I meant synergistic. The card is made for Eureka decks. Its pretty worthless outside of that scenario.
Your breakers do suck, but Temujin does two things that Sunny kinda needs.
1.) Speeds up your early game. I am talking your turn 1-3. You get to drop it and run three times to make some quick bank. Sunny really, really needs this to get most of her expensive stuff online.
2.) Strengthens your late game. Suddenly your chosen server costs 4 less credits to run. Kinda. With recurring credits it still stands to make you a cred or two and net you an access.
You can get around this by running Mimic/Yog as well.
I didn't have the "inefficiency" problem thanks to multithreader and solid play. I actually forced the corp to ice servers they did not want to ice (archives, asset economy) due to Temujin. It gave me the initial burst I needed to install other cards I needed and later on it provided a 4 credit free "click".
Also, you can just install over the card with a new copy if your money making server becomes too expensive to break.
But if you are having that problem, I would say run Liberated instead. But I am not having that problem quite so much in the CtM meta.