Yu-Gi-Oh! GX begins 10 years after the events of Yu-Gi-Oh! with the lead character Judai (Jaden) Yuki obtaining a Winged Kuriboh card from Yugi Muto, the renowned Duel Monsters champion, while on his way to a Duel Academy.
In the fictional universe of Yu-Gi-Oh!, Duel Monsters, a popular card game created by Maximillion Pegasus (Pegasus J. Crawford) is widely enjoyed. Referred to as a "duelist," a player of the game summons monsters and activates Spell and Trap Cards through Duel Disk technology to evoke various strategies to defeat his/her opponent in battle. A Duel typically begins with each contestant being given a life total of 4,000 Life Points, which can be decreased as opposing players "attack" him/her with their monsters or trigger the abilities of individual cards. The objective is to reduce an opponent's Life Points to zero, and therefore be declared the winner. Although conceived solely as a card game, Duel Monsters' roots are mythological in nature, and many exploit its otherworldly secrets for their own personal gain.
If you liked the original Yu-Gi-Oh! series then you will propably like the GX series as well.
The story is worst than the original, the dialogue and entertainment are fairly the same but the animation is way better.
In my opininion this anime is much better than the 5D's series so if you want to kill some time this anime is higly recommended.