I agree with Xenogias,
While the first few levels came pretty fast, I've been playing for a whole week now and have reached level 15 on my main toon and level 8 on an alt, and I'm guessing that leveling is going to be even slower as I get higher in level. I find the pace to be great. To be honest, I'm just experiencing the journey and not even paying much attention to the levels. Found my first datacron in Coruscant today and was excited to reach it.