Their method

X confuses …

X and Y confuse the issue

a misreading of …

The authors underestimate …

X and Y miss the point

It is very much an oversimplification to …

The authors fail to recognize US and GB or recognise GB …

The disadvantage of this approach is that …

A criticism of this explanation is that …

… an incorrect assumption

… unconvincing reasoning

… inadequate controls

… incorrectly assessed

… merely compounds the problem

X’s argument contains a number of inconsistencies: firstly, …

X’s argument that … is flawed.

X’s explanation of or for … is unconvincing

X’s explanation of … is hardly convincing

The author’s claim that … is not well founded.

the misleading statement that …

It is somewhat of an overstatement or exaggeration to claim that …

… contains a number of inaccuracies

a number of controversial viewpoints

In fact, the problem is more complex

The author fails to take … into account

X and Y take little or no account of …

The authors have, however, failed to take account of …

There is little or no systematic examination of …

The study fails to answer the question of or whether …

A problem with this argument is that …

the same problem also applies to …

There is little or no evidence to suggest that …

Next: Their results or conclusions

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