Of course. You gotta read One Piece. Naruto and Bleach a near the end. One Piece is nowhere close to the end. One Piece has a better overall plot, more characters with great potential, and all have been well developed. Even after more years at the market, it still has potential to last even longer. There is actually funny moments in almost each chapter.
And One Piece is - by far - the most popular manga in Japan.
When I started reading One Piece a few years back it took me 4 weeks to catch up. I got so excited I had to skip some chapters at one point to read something that came later, then go back and read those I skipped =D nonetheless, you have to start reading, when you have time for it, or it's gonna be bad for your sleep.
Btw, try reading a manga, that has already ended. It's really different from the ongoing, and you might like that even more. Try Basilisk, great manga, short, and fast to read!