Honestly they could condense it into a 2 hour film without too much trouble.
The series runs very slowly, some episodes are a single action scene stretched out that in most series would be only part of an episode. Even as a fan of epic length sagas I find Titan can move very slowly. Interestingly for all its pace I don't feel they gain depth with the pace either; indeed one major complaint I have of the series (though I admit that the artistic direction could also be a big element in this) is that you see a lot of characters die in epic scenes, but the gravity of those deaths is light because they hardly get much development and I find in the heat of battle one blurs into the next. Barring the more distinctive core handful the rest are rather hard to discern.
That said the story in itself is great; its got huge potential and a lot of mystery to it - the cliffhanger ending of the first season makes me eager for a second; especially as not only did they present new mysteries in that last episode, but they also left several major strings untouched from the first season. So whilst its got potential, I'm a little sad that they are re-telling the first again through films - I'd have rather we get right into a new season of discovery!