You're not. She's not a good actor.
The NA anime dubbing scene is just too small, low budget, and as mentioned by @electronic elephant it's dominated by a handful of entrenched cliques. It's not like the Japanese scene, which is very competitive. Japanese companies in turn don't really care about the quality of English dubs most of the time, and a huge chunk of fans these days rely on subtitles instead, so there's not much of an incentive to improve.