UK electric drive warships have had their share of problems, and the same is true of just about anything cutting edge and clever, civil or military.
Correct, but electric drive is hardly new. Turboelectric drive was routine in the 1920s. Colorado, New Mexico, and Tennessee class battleships, USS Langley and the Lexington class aircraft carriers. In WW II, 102 Buckley class destroyer escorts, 25 T2 class oilers, and close to all of the US submarines. Many ships of other nations, including ocean liners. It was a very reliable technology right from the beginning.