Shiraz wine is made from Syrah grapes which are a dark grape used for just about nothing but making wine. That said, Charles Shaw Shiraz being a red wine needs to be aired properly before drinking or it will have a bitter flavor that will be off putting. Now Shaw in general is the best you can get for your money in terms of wine so if you want a good time without the price this New Years then I'd get a few bottles.
Also, keep in mind that wine snobs dislike Shaw because it cost so little even though it normally slays in taste tests. Some people dislike wine but if you like wine and dislike Shaw you may be a dork hole.