Inglourious Basterds is possibly Tarantino's greatest film to date.
Each character is carefully developed, and with Colonel Hans Landa (a fantastic Christoph Waltz), we have perhaps the best film villain of recent years. Brad Pitt's Lt. Raine is a very entertaining watch, and Melanie Laurent is incredible as Shosanna Dreyfus - Tarantino always writes strong female characters into his films, and Dreyfus is certainly no weakling.
QT racks up the tension in this film, with long, brilliantly written, dialogue scenes - where violence ends up being the only way to release any of the tension on screen. The violence is typical Tarantino; it's bloody, brutal, but as ever over-the-top and darkly comical (the film's finale particularly illustrates this).
The criticism of this film not being historically accurate is a slightly pointless one, as you don't watch any Quentin Tarantino film expecting a history lesson... this is a 'What if?' film where a completely fictional set of events just happens to be set during World War 2.
This is worth a watch if you love your films to be a bit different, and as eccentric as its director.