'Bioshock' is fantastic, Impacto Profundo. It's definitely the storyline that makes it such a wonderful game IMO!
I'd like to nominate 'Dead Space' as one of the worst shooter games. If graphics are something we've all seen before that don't particularly impress, wouldn't the developers consider an original plot? Better gameplay? Perhaps some fantastic implementation of physics? Nope. You can raise the settings to maximum and the enemies still resemble giant pieces of ham.
'Call of Duty' is something that I will still occasionally play. The 'Splinter Cell', 'Rainbow Six' and 'Halo' series are all wonderful competitors.