I do see where your coming from. Many glercyine type shishas can be alittle overpowering in the sweetness factor. But I also enjoy the honey/mollasses based ones as well.
I think it's more of the accutal flavor that probably scores it for myself. I've tried many flavors (like peach, strawberry and coconut) in several - several different brands. Some flavors I perfer sweeter (strawberry & peach), but other I like more realistic tastes that less sweet shishas offer (coconut).
It's probably all down to personal tastes. As I always say - "What I like, you may hate and visa versa. You'll never know till you try it."