It's only tacky if it's not meaningful
I think the best wedding cake is one that shows something special to the bride & groom... Like one time on Ace of Cakes, Chef Duff & his team made a wedding cake shaped like the Stanley Cup because hockey was the reason the bride & groom got together. It was REALLY sweet.
Anyone attending the wedding can judge all they want... if THEY think it's tacky, fine, but if the bride & groom love it, that's all that matters