For the record, we stayed in 4 or 5 Ibis reds in the past month, and ALL gave two drinks vouchers, one or two even gave me a large JD and Pepsi - with out fuss or pleading.
We have had consistently better service in the Ibis than the Mecures - with exceptions of Toulouse Seilh and the Novotel Limoges ( there are a few others as well ), and thats why we chose to use the Ibis in France.
It does seem that the more you pay the less you get!