Pocket Bomberman is pretty good and very entertaining.
When you've come to the end of a level, you'll have to fight as boss. These boss fights usually has varied powers, but sometimes they're awfully predictable. The graphics is standard GBC graphics, you can't like them or hate them. The game has some good music and sound effects. When in boss fights - the music changes, to a more intense tone - very good.
Overall replay value: You can play this game for one or two times, put it away for some time, then play again. The game can keep you busy for a couple of hours or less, but it's definitely a good time waster - an entertaining time waster!
If you have a Gameboy Color i definitely recommend that you get Pocket Bomberman, cause it's one of the best games ever.