I think it's very much a case of does the good outweigh the bad and by how much. Cena is an interesting case to me because while I think this current run has been terrible, it's only been a couple months out of a twenty year-plus career. However, during those twenty-plus years, he's had a lot of bad matches surrounding some genuinely excellent performances. So while those excellent performances are enough to warrant a spot on my list (as of now), those bad stretches will keep him from ranking high.