Used to be a reasonably good source of photos, but since the site face-lift a few years ago employed a new search engine it has gone downhill badly. Ever heard of the expression "If it ain't broke, don't fix it"? Clearly the crew at Airliner.net haven't. Previous incarnation worked well, new search engine is unwieldy and often throws up very wayward results.
The Forums though are biggest problem. The moderators have not got a shred of an idea about management or customer service. If you read their forum rules, the terms and conditions they impose breach consumer law in many countries. When I entered a dispute with the moderators, they banned me without any right of appeal for simply standing up for my legal rights. Yet by the same token, one of their moderators was permitted to slander me and I was denied any recourse. In fact when I demanded an retraction and an apology from the moderator concerned, that was what prompted them to ban me.