I'm generally not a fan of Cohiba, but the siglo II, V, CE and Lancero are excellent.
I stay away from most RyJ, but the Petit Churchill is lovely and the Cazadores is one of my favorite cigars.
Old Vegueros was plain gross to me. New Vegueros is outstanding.
Cuaba Divinos are divine and the Salomones puts the Partagas version to shame.
Speaking of Partagas, Presidentes, shorts, E2 PCE, the rest....meh. Especially the lackluster and overhyped P2.
Upmann and Boli can do no wrong aside from some weak tubo showings.
The only marca that I have not explored in depth is Sancho Panza. I have smoked less than 20 cigars from this marca, and while none particularly stood out, none were so bad that I would avoid the entire marca moving forward.
Essentially, there is no marca that I avoid. There are only specific vitola that I prefer over others.