I've used La Quinta Lakeside on a number of occassions, usually when booking through hotwire.com . IMHO they are a perfectly adiquate American Motel style option. They are not luxury, but the rooms I've had have been clean, comfortable and reasonably equiped for the price. The pool area is better than most in it's price bracket and the location is also very good. It's 5 minutes to AK, 15 minutes to any of the other Disney parks using the back entrance into Disney on the 192 ( 2 minutes from La Quinta Inn).
When ever looking at "reviews" of resorts, restaurants etc it's always worth taking into account someone who'se had a substandard experience is far more likely to write a comment than someone whose had an adiquate or expected level of experience. IMHO price paid is a major key for satisfaction at this sort of hotel, I think I've always paid in the area of $35-50 a night for a room here and at that rate I think the resort offers good value, the rooms I've had were always clean and no problems as far as damp etc that seem to have been mentioned in some of the reviews. If I were to get a room that had damp patches etc I would demand I was moved to a better room. If prepay booking from the UK, I would first photo or video the offending areas, then ask the hotel to move me, if that fails get the local agent involved making all parties aware that I had photographic evidence of the health hazard.
If you can afford the upgrade, then staying on Disney is going to give you a much better chance of not having a dodgy experience, however for 2 weeks an extra $50 a night can add up to a pretty sizable chunk that could be put to better uses.
This goes for any hotel in the USA, if you get a substandard room, don't put up with it and moan when you get home, deal with the issue at the time. If necessary demand the tour operator finds you another hotel for the same price. IMHO there is no excuse for sub par rooms or hotels in the Orlando area, there are plenty of decent/adiquate ones and in my experience over several stays at La Quinta Inn Lakeside it's an adiquate hotel if you're paying the correct price for it ( i.e. under $50 per night)