No, it's not that big of a deal.
I'm of the opinion that however it is you enjoy scotch the best, that's the way to go.
Of course, this only goes to the point in which water or ice is included. But once people start talking about mixing nice single malt scotch with soda of some kind, my slapping hand gets ready. The only reason people do that is to mask the flavor of the spirit, which is improper for fine aged scotch. If you are going to mix scotch with soda, don't spend more than $10 on the bottle, and it had better be blended stuff, or better yet just get some vodka.
Now, as far as the Glenlivet goes, I actually don't like it too much. Even compared to scotches bottled at around 60%, I find Glenlivet 12 to have too much spirit burn for me. I have never liked it at all and have tried it several times along my road to palate sophistication so far. I find that while not a huge improvement, the Glenfiddich 12 is much smoother and sweeter. Or forget either and go to a better 12 year if not a 15 year.