My experience with Multiflight was brief, but generally positive. First of all they can't be blamed for the weather at LBA: it's well known about that fog and crosswinds are common. A great place to do your IR many people have said to me!
Also LBA is in Class D airspace so there can be issues with visibility for VFR flights on days that are otherwise perfectly flyable at other airfields.
I did 4 hours of my PPL with them but it took ages: I think the hit rate was 4 hours out of 9 booked (weather etc.). Back then they wouldn't let you book more than one slot on any given day (not sure if this is still the case). Might be different for commerical training.
Also if you are returning to LBA from a flight in rush hour you can end up orbiting for 20 minutes or more waiting for a gap between Flybe and Jet2: I have about an hour of orbit practice in my log book!
The people at Multiflight were always OK with me and the place is nice.