We all love it (from DH age 34, DS1 age nearly 4 and DS2 age 19mths!) (oh and me). Although with you having a girl I suspect you won't be as pirate/police/roman/knight orientated as we are!
DS1 will play with the knights for ages, making up little scenarios for them. Although I was slightly perturbed to walk in to find all of them lying down and i said "ah - are they all asleep?" and he said "No - they are DEAD". He also once had the policemen and robbers in some complicated Reservoir dogs style 'all guns pointing at each other' scenario. But usually the playmobil guys are peaceful little souls. As is DS1 to be fair!
DS2 seems to love the ambulance and shoving as many of the men into it as possible.
ebay often has cheap bits and pieces on it. We got a cracking castle and a selection of knights for a bargain.
I like it that the 'bad guys' have stubble and that the good guys don't.
we love playmobil too. i have two boys and we got the rock castle and dragon and the boys loved playing with it, the camper van was also a big hit. we have the aeroplane tucked away for ds2 birthday and he is going to love it! however they can be a bit fiddly to put together, but dh and me quite like that..
Yes, both dd1 (8 1/2) and dd2 (nearly 5) love playmobil. Have tried to steer them to knights and pirates, but they prefer the pink castles/princesses etc. Dd1's 9-year-old friend also still plays a lot with her circus set. The little figues which sell for a few pounds are also a hit as stocking fillers and mean you can branch out a bit without spending a fortune. It also means you end up with slightly surreal scenarios where the postman and the knights are having a BBQ with the pirates.