I've played every GTA game including the PSP ones. I do have fond memories of the old ones and I know there were stuff in the old games that did not make it into the new games. But still, overall, GTA4 is my favorite of them all.
Fundamentally it's so much of the same old in the missions that I got totally bored. It's still the same thing, you chase a car, shoot the guy and that's it.
There are improvements but most stuff is something that other games do already SO much better. Even the uncharted cover system worked better than in gta, also sneaking and shooting is mediocre at best when playability is concerned. And don't get me started on how much the bare hands fighting system sucks. I found the GPS to be excellent addition though, taxi so too. But in the end the real solution should have been save anywhere(NO NEED FOR GODDAMN TAXIS) or at least replay points in between missions not from the beginning. The whole bonding thing and going to strip clubs was an effort to make the game longer, I would rather not have done any of that stuff unless it's mission specific thing and something interesting happens. And did I say I found the minigames awfull, the pool? Why would anyone want to play such an boring representation of pool.
What I would have expected from next gen gtaiv would have been missions that actually are more varied and add to the game series rather than repeat the missions from earlier ones. Use the next gen power, make the guy able to parkour for example up the buildings, make more building accessible, make the shoot&cover&sneak system work at least half as good as mgs4 and so on. Maybe add a smash the buttons in right order as in heavenly sword/gow to create super moves in certain missions to get some nextgen graphics+animations embedded to missions. For example the
mission could have had several of those super move possibilites. If the super move fails then it's back to ground£ and maybe a replay later on to see what it would have been. Maybe add environments that can be partially destroyed to make traversing buildings more interesting.
For me it's mediocre game with huge amount of mediocre content. I don't game that much, I can choose and play only excellent games rather than use precious time to go through huge amount of mediocre stuff. If I hadn't already played the previous grand theft autos I would say the game would have been much more interesting, now it just felt just more the same. If it hadn' been my summer holiday I would probably not have played this game past 20%, now I had some excess time to waste.
Also the cutscenes were not interactive a bit. For example I hade perseus suite on and I was told to go and buy a suite in a mission briefing
final edit. They could have given us replay option to replay insane stunts and save them as youtube videos(with choosable camera placements and effects). That would have gotten me excited to make the most obscene crashes. This would have been nice next gen communitu feature.