Ranma 1/2 is the most hilarious anime ever. Even though you may already know what the plot for this story is; but to refresh your mind it's focused on this teenaged guy who turns to a woman when splashed with cold water. He reverts back to his original self when he is splashed with hot water. I would say this anime is a romance/action/martial arts/comedy.
The plot was really well done, there wasn't too much of each genre and everything isn't a drag. Although I mentioned that there wasn't too much of one genre, i would say there would be a tint more on comedy than the other two. I wouldn't say it's a fast paced anime, but everything was amusing to watch.
Although it's one of the older animes that were made, but it has some of the characteristics that some animes in the present don't have. Some of the scences that weren't used in the present animes and was used in ranma1/2 had a more effective response (emotion-wise)
Many people would think a long long anime is going to be very wrong, well their wrong (no offense) but there are some exceptions, and ranma1/2 is one of them. I had a CD collection and I just couldn't stop watching it lol.
This is a harem serious and most girls change into other creatures (you'll have to figure it out yourself).
I hope my review helped, give it a try! Better trying then not :) But I tell you it's AMAZING!