Really?
You must be playing some really, really poor games.
They could have done so much more with the heists, and I don't understand why they're splitting things between three characters in the first place. They're pandering to the casuals, and that just sucks ass.
I've always thought GTA was a pretty casual experience. Indeed, one of THE most casual, which is why it is so accessible for people of all backgrounds. Keep in mind though that when I posted that comment I hadn't completed the game yet and hadn't experienced the general drop in quality that begins after you meet Madrazo or so, and I hadn't quite realised that there were only about six heists. The story was what I was enjoying the most, but I made sure I hadn't spoiled anything at all before I picked up the game.
I also really enjoyed the three protagonists thing though, but only really the interaction between Trevor and Michael. Franklin is a bit of a lame duck without much to keep him interesting. I would have preferred Lamar.
But I would still to an extent rank GTA 5 in my top 5 games I've played in single player in the last 4 years, not counting the more "underground" stuff. If you think GTA 5 is "casualised" take a look at the mind numbing decline in the standard of games coming out of Valve - 10 year old engine + cell shading + hats = monetary success. These are the guys that made Half Life for god's sake, now look at them.