I don't think because you were in movies that were considered bad by critics means you are also a bad actress. Even if you are a good actor/actress, you'd still be limited by how good the script is.
No one really takes people who have done a movie or two as someone serious in the business. Paris Hilton, Madonna, and whoever else can have the title of "actress" to their name because they've done it here and there, but I think when these lists come out they actually only consider those who are full on actors/actresses. Otherwise, J Love is not the worst and you can throw all those reality stars who try acting into the mix as well.