Of course, there were mistakes made with Modlin, but you have to bear in mind the kind of situation that the management of that airport have had to deal with when you have Polish State Airports owning just over 30% but able to veto any resolution even if the other 70% vote for it and fully owns the shares in the other airport in the city of which the states own airline is the biggest customer.
It'll be interesting to see how Wizz get treated in coming years at WAW, bearing in mind the fact WAW recently volunteered to restrict night time flights to reduce noise, which would hit Wizz far more than anyone else, the recent discussion about capacity issues and placing restrictions on low cost carriers and the complaint that Ryanair claim to have made to the EC in relation to what they believe was unreasonable delay on their domestic flights and being allocated parking slots as far away from the terminal as possible.
There's even talk of building another airport in Warsaw right now just purely by the state although it remains to be seen if that is just some kind of trick to try and force the hands of other parties, since it would really make no financial sense to block Modlin expansion then fund a new airport from scratch or use Radom/Lodz which would be far more costly although there'd obviously be other non financial reasons for this.
As for the other airports, Yep, there's been problems there as well and honestly most of them have been held back at some point or other by PANSA and others and the whole running of aviation in Poland doesn't come across as the best and all seems rather too much geared towards WAW and the other airports are left neglected or get sidelined and are much of an afterthought.
Realistically I cannot see anything changing. I would quite like for all the airports to be totally independent of the state and airports that are close to each other to be totally independent of each other, that would benefit both Wizz and Ryanair. That's a pipe dream though, it'd stop all the things that are going on at the moment in Warsaw.