Thats really not enough. Its probably no 90%-game, but 80% should be possible and if its under 70% its hard to take it serious. At least, with the argumentation from the gameinformer.
And i say that, as someone who is quite a bit disappointed.
Edit: Hm, i cant take some gamesites serious anyway, i only read complains (but many, specially on the PC-Version) about some of the mechanics in the commentaries.
People who are ok with the sneakattack shouldnt be that much anymore.