I say yes.
Recently LFS has been quite repetitive/monotonous and while it IS good for going to go race online and get a lot of fun races done in one night, I personally don't think it is improving with regards to it's aging ability. In other words, it is same old stuff every night, and while you may find it fun once in a while, it is good to take a break and try some other sims.
rFactor has quite a good atmosphere for modability and options. Things get VERY rough online and completing a race takes a long time with the session system (practice 1, qualifying, warmup, then race). There aren't lots of competitive drivers out there in rFactor, because they all do leagues, but I think you'll find it is alright for a start.
To me, rFactor is something I feel like playing in my off-time, to try some mod, some car, or a fancy track.... all usually offline. If I play online the choices of games to join are very low because there will be about 75% of servers that are using mods you don't have, or have no desire to play in (eg some redneck dirt oval mod, or some special mod you've never heard of). The usual choice of a server is with the Renault Megane, Porsche Supercup 2007, and maybe the F3 Euroseries mod. Even then, your choices are slim with those mods, only about 3-5 servers that will be worth joining.
Overall? You'll find some difficulties with the game here and there, but I bought it to try something new, and to have options when I don't feel like playing LFS. It's nice to have, and always nice to play around with.
If LFS could get the ball rolling on making substantial changes to the game, maybe then I wouldn't be talking about rFactor period. Because the current build of S2 still feels 3 years old to me. Get rFactor, and you'll wonder why a lot of things aren't made in LFS like they are in rFactor.