Depends how much you weight you place on 'anti-Israel NGO'. Assessing for myself by simply watching the content, I do not find it objectionable. Referring to what is happening in Gaza as 'ethnic cleansing' is not biased language, it is calling a spade a spade. IMO.
The Wikipedia page for ngo-monitor.org is quite revealing:
> NGO Monitor is a right-wing organization based in Jerusalem that reports on international NGO (non-governmental organisation) activity from a pro-Israel perspective.