Firstly, if it wasn't for Legoland this hotel would not exist. Because there is a demand for capacity, people will end up staying here and so the place will make money whatever they do - and they don't do much!
On arrival, the reception staff will make a point of continuing their personal conversations before bothering to serve you - it is clearly a policy as this happened every time we approached them. If you have the mis-fortune to end up in a room facing the bar/garden, then be prepared !!! The basic problem is that there is no seregation between rooms, recreation, restaurants, staff areas etc., so you will get no peace during the stay - not helped by the wafer-thin pre-fab construction and lack of any consideration for guests' comfort. Don't bother asking for help after midnight as no-one bothers to pick up the phone anyway.
For a 4 star hotel, I do not expect cheap plastic coffee and water cups, no storage space or secure locker, no storage or shelf area in the bathroom, no air con or fan. Other reviewers have commented on the other short-comings, and they are telling the truth.
We experienced the breakfast and evening buffets. Again, this is nowhere near 4 star quality and we noticed the breakfast spread is significantly reduced at the weekend (just one heated offering - boiled eggs) - so you will get ripped off even more of you stay on a Friday or Saturday night. There is a kids' play area by the restaurant - complete with broken tv and vidoe games and mostly filled with machines to extract more money out of you. Apart from this there is a trampoline outside and so rather dirty looking water areas, but at busy times your children better be prepared to fight for their space.
A final piece of advice - check your bill carefully on checkout as you will find some interesting items (all in codes so you won't know what your being charged for) so I strongly recommend you keep a record of what you spend and what charges you have agreed beforehand. Overall, if there is no other hotel available then change the dates of your visit.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.