I think the single worst I've fought was on a Browning BLR in 7mm mag. One of the most disappointing was on a Winchester 94/22M .. sweet gun, but the trigger was mush making it hard to shoot up to its potential.
Ruger 77s are often bad, 77/22 as well. Most of the Ruger triggers can be improved with available aftermarket parts. To me that kinda moves them out of the "worst" category.