Agree with much of what Sufyan said. I'll also say that when I first started playing the game, I was also under the impression that it was just a mainly TB combat game with a little RPG thrown in on top. But that's actually quite wrong. There is a lot of story in the game, and there are ample opportunities to roleplay. Sure, you get a lot of 'learn more' options in convos, but if you skill up your character with the - surprise, surprise - 'convo' options (Hard Ass, Smart Ass, Kiss Ass), then you get more opportunities to advance the convo, gather info, branch out further.
There's a lot of background chatter that adds not only to the game atmosphere but also to the lore. There are some tough choices to make as well. There are multiple ways to solve many quests, and not all of them end in the most satisfying way. Sometimes the choices you make just end up being bad for one side, or bad for everyone. Some convo options are one-shot only (just like it should be) where if you don't take that option right away, it disappears. So while the conversations aren't set out as the traditional branching dialog trees, many conversations effectively function similarly to that. But in some ways I think it's better, since you don't always get the chance to go back through the trees and exhaust all the options.
You can build your character any way you want, without being restricted by some arbitrary 'class' restriction. This is, of course, limited by your skill points, but you can distribute them fairly evenly across the board (a 'jack of all trades' type), focus on two or three areas (a specialist), focus on combat with a couple side skills (the 'veteran'), focus on general skills (the 'diplomat' or worldly type), or focus on utility skills (the 'expert'). There are a ton of ways to play your character(s).
Overall, there's a lot more RPG in the game than reviews tend to make you believe there will be.