The Butterfly Effect (2003)9/10
The Butterfly Effect 2 (2006)A little more action-oriented and I think that's what breaks the movie, but still, it wasn't awful.
6.5-7/10
The Butterfly Effect 3: Revelations (2009)It tries some few, bold things but iverall fails short like the second one. Slightly better than it but significantly distant from the "greatness" of the first movie.
And yes, there is at least one revelation in this movie. The subtitle ain't just there to be.
Spoiler
One such revelation is time-travel being acknowledged by multiple people, including one who has a deeper purpose in the plot and has the same abilities too. But what about the Professor, who I do not think posesses such powers...?
Sadly none of this is explained much in the movie and is just there for the shock factor.
7.4/10
If you have a least of interest into this series then go watch the first one. The other two are there to satisfy your carving even if they're not very awful.