From what I hear, Napoli plays attacking football. Villareal does the same and Man City has been playing free flowing football so far this year. I think it's going to be a joy to watch the games in this group.
Napoli is crrrazyyyyy with its attacking football. Lavezzi, Hamsik, Cavani, and now Pandev.

although barca raped them 5-0 in a friendly a few days ago

Villareal is very similar too. Great attacking football too. Rossi, Nilmar, and Cani. I really wanted Rossi to move to Barca, but no need...
because they (villareal) were raped 5-0

Who do you guys think are the top contenders for the UEFA CL this year?
My top 5 in order would be:
1 Barca
2 Man U
3 Real Madrid
4 Inter Milan
5 Man City