Geist is not a Wraith re-make, so don't go in looking for similarities if you were a fan of that game.
I've never played Wraith and have yet to play Geist (although I've read this book). That said, this game has a good amount of potential and I look forward to starting it in this fall's gaming season with my troupe. The game's central theme is death, and players portray mortals who have died and been given a second chance at life (not unlife) by ghost-like creatures called Geists. These Geists form a symbiosis with the revitalized mortal, creating a Sin-Eater - a person who serves as liaison to the dead.
Ethan Skemp is a good writer in my opinion, and the story elements of this book/game are cool. I do, however, understand the confusion a lot of Geist players and critics seem to have about how the game's systems and concepts should be interpreted. There are a wide variety of powers to deal with, such as Manifestations (with various Keys) and rituals, which creates a greater amount of game-specific jargon than usual (at least in my opinion). The Krewe (troupe) systems struck me as over-wrought, and my Storyteller and I quickly decided to abandon them altogether; this game seems best suited to small, personal stories about individual characters and deaths, rather than influential political or ideological units.
The powers are pretty cool if you can get past the volume of note-taking that seems necessary, and the Underworld is pretty cool (particularly as outlined in the "Book of the Dead" WoD supplement). Given the pervasiveness of death, this game has a lot of crossover potential for other WoD games, and our Vampire games have seen no shortage of cool Sin-Eater cameos. I will note that the creators were pretty liberal in terms to giving Sin-Eaters powers well beyond the scope of death, and I see the potential for power-hungry players to abuse the toughness of Sin-Eaters if not carefully reigned in by the Storyteller. Thankfully, the Storyteller-controlled Geist gives you the means to do this if you're savvy.
Overall, I gave it 3 stars because this game strikes me as love-it-or-leave-it. Personally, I'm lukewarm on the material itself, but my friend/Storyteller is so enthusiastic about it that I'm interested in playing on faith. As I said, there's definitely potential here if you're interested in death and second chances as themes (and have a lot of faith in the Storyteller). If that's the case, you may yet enjoy this game. (It should be noted that to date, Book of the Dead is the closest thing to a Geist supplement available. To my knowledge, no more Geist sourcebooks are forthcoming. This leaves it up to you to flesh out and expand the universe if this book's not enough, for better or worse).