The more Japanese commercials I see, the more I want to say no. If they're humorous, either intentionally or unintentionally, I say keep them, but if they're just boring ads that you can't understand we should probably just skip them.
Most of them are going to be pretty bad/unwatchable by an English speaking audience. There are some hilarious exceptions though. Two of my favorite commercials out of the whole pack would be the Hong Kong Atari commercials and the SNES Legend of Zelda commercial.
The guy from Hong Kong singing "Have You Played Atari Today" sounds like he's going to decapitate you with his samurai sword if you don't play Pac-Man NOW. The Zelda one has someone dressed up as Link (who may be female) in front of a dance squad and they're like the Fly Girls from Hyrule.
Use your own discression, and don't send me a bunch of boring Japan crap to sift through
