If you're after good acoustics, comfortable seats, great sight-lines, or other comfort based accouterments ... then you'd be far better placed to buy a ticket and go see the Symphony at the UVIC Centre or the Royal Theatre.
The Symphony Splash is a outdoor social and cultural event ... and is certainly not intended to offer anything even close to what you'd get watching them in either of their "home" venues.
There are no "acoustics" in the traditional sense ... as everything you hear is coming out of speakers.
To imply that the Splash appeals only to "classical fans" is incorrect ... indeed most subscribers and regular attendees at the Royal or UVIC either volunteer to assist (thus, hopefully spreading their love of classical music), or simply stay at home ... none of the Symphony's "regulars" are down at the Inner Harbour rendering their critical opinions of the theme to "Star Wars".
As well, to compare the fireworks at the Splash to those out at the Gardens is misplaced.
Christopher Ross, who designed all the fireworks shows out at the Gardens was one of the worlds great fireworks designers, and the shows at the Gardens are world class undertakings. Realistically, no fireworks shows compare to those at the Gardens, because Christopher designed his shows as classically French fireworks shows, which need a permanent home, and follow a centuries old pattern of tableau and interlude.
In other words, the fireworks shows at the Splash are unloaded from the back of a truck, whereas the fireworks shows at the Gardens take 15 guys a week to get ready, and in some cases have taken a year to construct.
They're like chalk and cheese ... and always worth remembering that, when you're viewing a fireworks show at the Gardens, you're viewing a fireworks show which is one of the very finest to be seen anywhere in the world.
You may see bigger shows in the U.S. and the far east, but you'll not ever see more artistic fireworks creations that those Christopher designed for the Gardens.