- the church look lopsided, as it was designed for ad-orientem celebration
- the Altar look like a minor furnishing in the sanctuary rather than the total centre of worship (ie just a table).
One of the less disturbing examples is shown here.
The sanctuary is separated from the nave by a substantial arrangement of stairs and walls, which reminded me of the arrangement of the Old St Peters. the Altar itself is surmounted on two steps with a timber third step (or pradella) being that on which the priest celebrates upon. The whole Altar is framed by the ciborium.
Of course these churches would have had the celebration of Mass in the evolving classical form until 40 years ago. There was no problem with celebrating the Tridentine Mass versus populum so I cannot see what the problem is with the Ordniary form (Novus Ordo) Mass being celebrated ad orientem.