Marek is a good player but not sure he suits a 4-4-2. Clearly he would be better in a 4-5-1 or 4-4-1-1 (with him the one behind the striker).
I do not think we really need him this season in all truth as Cisse, Harper, Gunnarson and Karacan are all probably better suited to this division, but I think he will have a huge part to play in the PL next season if we do get promoted. One of our downfalls last season was that we played 4-4-2 away without much success. One of the other formations is likely to be more productive away from home in the PL IMO.
In the Championship we have to play 4-4-2 home and away as we need to win games.