Last spring I started dipping my toes into MMOs again after writing them off long ago, and after trying LOTRO and then DDO, I tried SWTOR and found it to be the place I stuck around longest.
The dedicated class missions sucked me in pretty good, and I like how I can enjoy myself during short casual play-sessions, as well as longer sessions where I knock out heroic missions or flashpoints. Public grouping is easy and generally stress-free (at least in leveling content...haven't tried any end-game Operations yet).
I also think it's the most viable f2p game to play without a subscription, because of the Unlocks that are sold on the auction house. I bought account-wide artifact usage for about 400,000 credits in the auction house, and that normally sells for around $18 on the cash shop. I know SWTOR gets knocked for its heavy restriction on free players, but by spending about 10 bucks up front, I got everything I needed to enjoy the game while leveling (like full crew skills and an extra hotbar), and by the time I hit 50 I had bought everything else I need on the auction house like artifact usage, extra cargo space, guild bank access, etc. The main limitation is the credit cap, but now that you can transfer credits from your escrow account for a couple bucks here and there, I'm not too worried about it. Certainly cheaper than $15/month, and I feel like I actually own a game instead of renting it.
What servers do folks play on? I'm on Bergeron Colony, if I'm remembering the name right. I only have one character, who's at lvl 51 and still taking his time to wrap up the Chapter 3 class mission (having a new son arrive a couple months ago kinda put a damper in my playtime, but fortunately I can come back anytime and not worry about a subscription! Count me among those who actually kinda like the recent f2p trend...).