which shiraz did you try before and was there any reason why you didn't prefer it? that said, shiraz/syrah is made in many different styles so it could be a vintage, region or even a producer factor that you didn't like.
I remember trying out my first few glasses of shiraz years back and i didn't like it at all. It was often too spicy, peppery coupled with rough and edgy tannins.
I recalled those few glasses are house pours from some casual restaurants.
It was only later i tried out better shiraz bottles and develop a liking for shiraz, and realised that the first few glasses might actually be "bad" or "not so good" bottles of shiraz wine.