I reckon TinyURL is good. Much better than huge URLs. It seems some don't like it though. The reason being that there is no indication where a link leads to. I suppose it might be possible to follow a TinyURL link that leads to some malicious site or other but that's not any more likely than if you follow any other sort of link in my opinion. I once made quite a few posts in a computer forum before discovering that my TinyURL links weren't being trusted by small number of members. Dead hurt I was!
Anyway, since then, I use the actual URL if it's not too long, or hide the link behind some text using BBCode if it is ...like this
. If you hover the mouse over this link, the actual URL shows up in the browser Status Bar.