Maric spent the vast majority of his career in Europe as a 3rd center on terrible teams. So yeah, not sure what you were expecting from him. He had like 2 good years in his whole career in Europe, and just 1 season where he was even decent in EuroLeague.
His EuroLeague numbers for example:
2009-10: 14.6 points / 8.4 rebounds
2010-11: 3.5 points / 3.5 rebounds
2011-12: 3.6 points / 2.5 rebounds
2012-13: dropped down to 2nd tier level EuroCup - 11.4 points / 7.4 rebounds
2013-14: back to top tier level EuroLeague - 6.1 points / 3.6 rebounds
2014-15: 2.3 points / 2.3 rebounds
2015-16: dropped down to 2nd tier level EuroCup again -
6.0 points / 4.9 rebounds
Within the last few years of his career in Europe, he was a pure 3rd string center in EuroLeague, who then ended up being just a below average backup at 2nd tier EuroCup level.
And again, had just one good EuroLeague season in his whole career.