Nemesis its also a step in the wrong direction, its the script that makes a film great not the special effects
IE: Reservior Dogs, pulp fiction, star trek 2, indiana jones and star wars 1-3 and inglorious bastards

gratuitous effects are gratuitous none the less and do not make a film that pretty much plays it safe in all other regards great
it just makes it mediocre

the only way I'd watch avatar is with the rifftrax playing in the background, other than that I would never spend a penny on it.
http://www.rifftrax.com/rifftrax/avatar