[Review written for lazy people like myself who can't be bothered reading long ones]
Arakawa Under The Bridge is possibly the only gag manga I can actually stand. Instead of just seeming stupid and pointless, I actually find it funny and smart.
Each chapter is short and ends quirkly with a joke, so if you only have time for around 5 pages you'll still get enjoyment out of it.
The characters are extremly likeable, each one has a story behind them. If you are a fan of the anime you will really appreciate seeing more of their back stories like I did. Even though this is a gag manga my throat has swelled up more than once during reading.
The art isn't as good as many other manga artists, but I think the style suits the story. The managaka is also very likeable, all her commentaries and extras amuse me.
Overall, this is an amazing manga and if you're consdering reading it; DO IT.