Oh yes, thats why the first actual trailer from X-Men 2 had a lot of action, as well. *rolls eyes* It's called an action movie, grow the hell up.
The only reason the X3 trailer came out with a bang is the same reason X2 did the same; it's already an established series and has been very current lately and hugely popular, where-as with Batman and Supes, they are coming back after long, long breaks and are taking it cautious just in case to lead people up to it.
Because the X3 trailer has action means nothing in terms of the actual movie, as X2 had the same and it is still one of the best comic book movies ever made.