From wikipedia:

"Despite being obsolescent, the Swordfish achieved some spectacular successes during the war, including sinking one battleship and damaging two others belonging to the Regia Marina (the Italian navy) during the Battle of Taranto, and the famous attack on the German battleship Bismarck, which contributed to her eventually being sunk. Swordfishes sank a greater tonnage of Axis shipping than any other Allied aircraft during the war. The Swordfish remained in front-line service until V-E Day, having outlasted some of the aircraft intended to replace it."

They also took part in the Norwegian campaign, the (still controversial) attack on Mers-el-Kébir, the defense of Malta and the Battle of Cape Matapan.

The fact that was slow had some advantages for launching torpedoes. I've also heard it said that the Bismarck struggled to shoot them down because its fire control systems were not calibrated for planes that slow (don't know if that is true).

"Indeed, its takeoff and landing speeds were so low that, unlike most carrier-based aircraft, it did not require the carrier to be steaming into the wind. On occasion, when the wind was right, Swordfish were flown from a carrier at anchor."

Despite looking like something from WW1, they only entered service in 1936.

There is one on display at the Imperial War museum in Duxford, UK.

My father had a friend who flew Swordfishes in WW2. He was quite a character.