She's somewhat fast, at speed 34, she needs only 2 extra speed to block spawn rooms diagonally after opening a door. You're free to keep her at level 1 for a long time, especially on multiplayer when extra heroes are assured in Sanitary Pod, and you can simply swap Joleri out for that hero. Her passive takes away dust from you, but the passive only applies when you get her to level 2. She has the best starting stats for a non operator, bar none. Lady Joleri Tupak- Excellent for first 6 floors, on any pod. It's a single player game, I suggest you play as intended lest you ruin your own experience.
Characters are also rated without the consideration of certain exploits, exploits in which I shan't specify here. The big problem with making a tier list in this game is that most characters are situational. Most of these notes apply to Sanitary Pod (A lot of people still don't know this is the actual hard mode), but I have some notes for other pods. I think it's extremely difficult to rate heroes without actually playing with them because there are just too many factors per hero. Keep in mind, characters have different starting stats and gain these stats at different rates as well. I'll grade heroes in their entirety, not just abilities.