My personal wish for improvement over UC1 and UC2 is fewer enemies, but no auto-heal. Personally I like having to use (and be economical with) healing stuff. And also with no auto-heal they can introduce protective equipment for Drake to find / wear, and instead of your companions being invincible they can take damage too, which you will need to use your healing materials on them for them to live through the companion levels.
Other than that the overall gameplay elements in the previous 2 games are fine for me. As a much bigger platformer fan than shooter fan I'd be more than happy to see the platform:Shooting ration move even further towards platforming (and by extension puzzles).
As to GT5 UC1 and 2 are already better than GT5 IMO. But UC3 needs to beat Valkyria Chronicles and Demon's Souls to be a contender for GOTG for me.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
