Every reviewer's review is going to be different wrt to notes, but there's nothing in the VM description that contradicts what Parker, Halliday etc. are saying.
Shirvington make reds in a traditional "big" SA style. Some of their vintages are pushing 15.5% or 16%. The 2013 was the first I've tried that had a more normal 14% ABV.
If you like big, bold McLaren Vale shiraz, then that's what Shirvington normally dish up. Back in the early 2000s the winemakers were Sparky and Sarah of Mollydooker fame (so that probably gives you an idea of the wine being produced)
My reviews are on CellarTracker - I've tried the 2003, 2004, 2005, 2006, 2009 and 2013 (not up yet) shiraz, plus a bunch of their cabernets in the past 12-18 months, so you should have quite a few reviews to pick from.