Five is all flashy chrome, it appears as was Four to be an experiment in 'pretty'. So they gave up game Playing to look good.
San Andreas is a Game to be Played. To allow the Player to think of what weapons, vehicle, and approach to the problem is best. You can Explore and be rewarded with FREE weapons and body armour.
You have no choices in Five, you must use what limited weapon and vehicle the game has chosen, you follow the route laid out, you watch the movie as the game sets up the attack. You are then permitted to point the weapon and fire it.
So, while there is a lot of space (not worth exploring because there is really nothing to find beyond pretty views) you really don't have much to do.
San Andreas allows for an easy comfortable beginning. You decide when you want to start missions.y
Five dumps the Player into a vicious fire-fight before you even know what is going on AND you must complete it and a chase before you are free to roam. A most unpleasant way to begin learning 'new' controls.
GTA IV killed SA already, and V basically killed it again.
Honestly doubt you played V so much, you can explore in V, and you CAN
get weapons and armour for free.
Limited weapons? Lolwhat???
SA had 39 weapons, and 2 of them being available only via cheats, and many of them being repeated melee weapons, GTA V on the other hand, had 38 but you could modify them, tints, scopes, silencers, extended clips, flashlight modifications, you could have multiple weapons in 1 slot which was another plus, far from realistic, but it isn't much more realistic in SA.
Also, there was literally no point where you couldn't switch the weapon you're using except for a very few.
And that movie thing where it sets up a route and everything, you don't actually have to follow the route on the GPS, and most importantly, it was like that in SA anyway.
Also, nothing to explore? Come on, it had way more to explore than SA, the woods in SA felt dead, bland, generic, et cetera et cetera.
Easy and comfortable beginning? Err what? That's really, really minor. It's been like that in GTA III and nobody complained, and there isn't a chase in the beginning, you actually have to follow the guy. Come on, don't tell me you don't have 5 minutes spare to complete the first two missions.
Although I like SA, it was never my favourite GTA.