I have used LHR about 14 times in the last 6 years and yes is crowded, very crowded at times, yes it could be cleaner. It could be better in many ways but considering the huge number of people that use this airport every day, it pretty good. The best things about LHR are that the signage is really very good, it's easy to find your way around, and the airport staff are never anything but very helpful and smiling. Getting from one terminal to another can take some time, but it could be much worse, (try Manila International for example). Have a little patience and remember you are in the world's largest and busiest airport. That considered it's pretty good.

3 stars only because of all the places one can get to from LHR. And it isn't about a 3rd runway; it's about customer service. Never enough chairs in T3 or T5 for the number of people, either in the main waiting area or in the gates. T1 is actually OK now that it is used for Star Alliance. For now anyway. Always queues at food shops and not enough seating. Who wants to balance food and drink on your lap in all the hustle an bustle. In T3 it's all about duty-free shopping. In T5 it's absolutely great landside but airside is just like T3: crowded with the same old same old. At best it needs to have UK flights that are feeders only and not point-to-point. And Gatwick is every bit as easy to get to as LHR.

Absolutely hate this airport. It’s huge and confusing you have to walk up to 30 minutes just to catch a bus so it would take you to the other terminal. Then you have to check-in and walk another 30 minutes until you reach your gate number; just an awful experience. It is good, however, for entertainment purposes. It has tons of stores (overpriced) and food is alright.

I hate the airports when they put us on bus to change terminals. Unfortunately, Heathrow is one of them. When I was on the bus, the bus driver purposely drove over Indian workers who were working on the ground and the Indian workers wanted to stop the bus to argue with the bus driver but the driver did not stop.

I have used LHR on a large number of occasions and I will continue to use because I have no choice. Yes, it is big and spread out, but getting around is not difficult but could be made easier. The food outlets are varied but very overpriced. If you are going to be here for some time, bring food with you, doing so will save you lots of money. Huge numbers of retail outlets, again overpriced, but you can pass a lot of time window shopping. Easily the best thing about this airport are the staff. I have nothing but praise for the employees here, very helpful and friendly, never once met a rude staff member here. This airport is functional, Terminal 1 needs to be renovated but considering its size and the number of passengers that pass through it copes very well. 8/10 for the airport. 10/10 for the staff.