邓肯·斯图尔特声称，MetroLink 成本过高，排放量过高，不合理。 MetroLink costs would be exorbitant and emissions too high to justify, Duncan Stewart claims.

建筑师兼环保主义者邓肯·斯图尔特 (Duncan Stewart) 声称，耗资 95 亿欧元的都柏林 MetroLink 项目“存在严重缺陷”、“成本过高”且碳密集。 Architect and environmentalist Duncan Stewart claims the €9.5 billion MetroLink project in Dublin is "seriously flawed", "exorbitantly expensive", and carbon intensive. 他认为它与其他铁路系统不兼容，无法满足出行需求。 He suggests it is incompatible with other rail systems and cannot address mobility needs. 斯图尔特提议重组都柏林市中心公交车的逆流路线，并认为机场管理局和航空公司应该为该项目提供资金。 Stewart proposes reorganizing Dublin city centre buses on a contraflow route and argues the airport authority and airlines should fund the project.