Alright, there's numerous things that can be said about this game, 99% of them being positive. It's just unbelievable.
First, a run down of what exactly this game is.
Tales of Vesperia is an installment in the Tales Of series which had such big hits as: Tales of Symphonia and Tales of Abyss. ToV chronicles the adventures of a boy named Yuri who one day meets up with this girl Estelle while trying to escape from the castle prison after breaking into a residence to attempt to take back a missing blastia core (blastia are special mechanisms coming in many forms). As with any group of adventurers, Yuri, Estelle, and Yuri's loyal canine ally, Repede, set off on a journey. However, (cue lightning and intense music) what they don't know is that their numbers shall grow, and their purpose for adventuring shall change many times.
So, what is so fantastic about said game? Well, first off, the graphics in the game are flat-out extraordinary. The animations look very colorful and livid, and the cutscenes are intense. As with any Tales Of game, ToV comes with its own line of side quests, each one varying in length and importance. With a plot that comes with a wide variety of twists and turns and superb battle sequences, this game will keep anyone busy for 50+ hours. In addition, if you consider yourself an achievement guru, there's a long line of achievements that can be obtained throughout this game, some of which, that can only be obtained through replaying the game.
In the end, Tales of Vesperia is definately up there along with Tales of Symphonia in terms of greatness, and may even surpass it.