When I was watching the draw I thought that Arsenal would get through easily but thinking about it they have quite a hard one. They should beat all the teams at home but Sevilla are awesome at home, Greeks are always good at home, Bucharest have a small compact stadium who's fans will just sing like mad and Slavia Prague beat Ajax twice.
Man Utd beat Roma 7-1 last season and should win all home games and Roma away. I think that Sporting and Dynamo Kiev will beat them away.
I have a feeling that Liverpool won't beat Porto but will beat Marseille twice and will lose away to Besiktas but win home
I think that Chelsea will lose to Valencia twice and beat Rosenborg twice but lose away to Schalke and win home.
Rangers are out and Celtic have a chance.