Who knows the best free rendering engine for animations?

which render engine should I use to render HD animations? I read a lot of bad critiques about the inbuilt render engine.
Some reports about satisfying experiences would be helpful!

Rather than tread over old ground, see this thread http://blenderartists.org/forum/showthread.php?t=204336&page=1

I read a lot of bad critiques about the inbuilt render engine.
Have you actually tried it ? Don’t believe all the rubbish that certain users spew out on these forums, it all depends on what look you are looking for in your animation.
Not a bad animation used with the internal blender renderer http://www.bigbuckbunny.org/index.php/download/

sorry I didn’t find the posted thread before. But thanks!

Have you actually tried it ?

a lot! by the time I worked for my animation www.youtube.com/watch?v=v8dIqyfHQZ0 it wasn’t even possible to render a frame above 720p. Else, blender crashed after every tenth frame … maybe I did something wrong. Why HD? - I hate pixelized animation
by the way, bickbuckbunny was amongst others a reason for me to start with blender
Mhh… it looks like I’ll stay with blenders internal