I can sum up this place with one word : Interesting.
And because of this I'd say it's A-OK. It's hard for me to rate Nandos as this is the only place I know of to get peri-peri chicken. Definitely the draw of this place is the different types of chillies/sauces you get to try with the chicken each having a very distinctive and interesting flavor. Drawbacks are that the serving isn't particularly large so I never get full afterwards and the chicken does tend to be on the dry side from time to time.