Rosenbaum is by far THE Luthor
To this day despite mostly not enjoying the majority of the show (I dropped it totally when Rbaum left), his performance is just like something out of a dream. Like, its so good I feel he was miscast because he carries every single episode he's in. It's kind of crazy to look at Smallville in hindsight because of this.
...
And yeah, fuck Alison Mack.