Yes, I know what you mean about short bursts.
FC1 I still play from time to time and love it except for the creatures.
FC2 was too brown for my taste.
FC3 is when it really took off and I played the hell out of that one. It's the only FC that I went full out on to the end, including the naughty scene, cough.
FC4 I lost all my progress about 75% through and it was just ok.
FC5 was weird and ruined by some impossible missions - 'Only you...'anyone? I grabbed a great Vietnam era heli with weapons which I still fly around for the heck of it.
FC New Dawn has an interesting premise and again I dip into it from time to time. At the moment I'm trying to infiltrate the aircraft carrier but keep getting killed.
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FC Primal I just couldn't get hooked.