We ate at Wagamama Greenwich O2 prior to attending at show at the O2 arena and although the restaurant was queued out the door, the line moved quickly and we were soon seated inside.
We had to wait approximately 10 minutes for our order to be taken where we ordered drinks, a main and a side. After about 15 minutes the food arrived Wagamama style (as and when each dish is ready). It was all delivered hot and pleasantly presented. Everything was tasty and we ate every bite. Slightly strangely the background music was entirely Michael Jackson but that didn't bother us. It was rather loud, due to being full and busy but easy enough to make conversation.
We paid the bill through the web app and thought it was great value for money. Really happy with our experience and would happily eat here again.