I'm very glad that I was raised in the wrestling/judo world before starting aikido. Though nowadays I wouldn't trade anyplace for my aikido dojo, I still like to go occaisionally play with the bjjers - they're fun! But as has been said elsewhere, it really matters what your goals are for training as every art offers something different.
I go through periods where I just wanna get together with people, throw the gloves, mouthguard and cup on -- and bang around a bit -- sometimes getting hit, choked/tapped can be good "spiritual" development for its own sake in terms of reinforcing humility
. .(though the *swagger* of MMA culture can get tiresome, I find that it exists in its own form in all martial sports/arts and have personally experienced very good sportsmen-like attitudes in this environment)