I think it depends on what you are comparing it to. For it's time (one of the first games released on the original playstation) it was a pretty serious game. Need to remember that games like Super Mario Brothers were still some of the most popular games on the market back then.

By todays standards it is a little more on the kiddy though. If you try to compare it to The Last of Us Final Fantasy VII looks like it was made for a five year old.

So it really just depends on what you are comparing it to. If you are only comparing it to other games released around that time of the mid to late '90's it was a pretty serious game. In 2013 or 2014 however it would be viewed as a pretty juvenile game.