Alestorm has a couple of good songs (Nancy the Tavern Wench is a great festival party song, Captain Morgan's Revenge itself is a fairly good sing along), but are pretty uninspiring generally.
The Swashbuckle bassist/singer dude seems to have ridiculous fucking chops and quite powerful vocals, I'd like to see him do something serious. Swashbuckle might be a laugh live if they are tight, but I got bored of their recorded stuff VERY quickly.