Webcams of this type and age have megapixels of between 0.3MP and 20MP, and the average megapixel is 2.5MP. The PLCM22IR has a fairly low megapixel (only 0.3 megapixels) compared to most of the other webcams of this type and age.
We compared all the other 0.3MP webcams to this webcam and we think the PLCM37FRV (£22.99), the PLCM19, and the PLCM21 all from Pyle which all of have better reviews are also worth considering.
If this webcam megapixel is too low for you then you might want to consider the Axis M1143-L (0.48MP and higher rated), or the Microsoft LifeCam HD-5000 (£59.99) (1MP and higher rated).
What does "megapixel" mean?