4.8 rating is way too low.
This is a 90's adventure classic. I've loved it since I saw it the first time back in 1997 on TV at age ten. Although it is by no means an original masterpiece, its silly fun factor is quite high.
The dialogue and characters are pretty good compared to your average dumb adventure films. It's also amusing that it was heavily criticized for not using computer generated apes. Thank the cosmos that they didn't. Even by the standards of today, these computer generated animals/apes in films never really look real. They pulled off the apes in Congo well with practical costuming, puppetry and make-up.
Between 6-7 would be fair as a rating. I would personally give it a solid 7, I can't understand the hate this movie has gotten.