For a model which is nearly 30 years old, the Italeri Sherman is still very good. It only needs a few changes to make it better.
Like everyone says, change the tracks. Swap them for some more flexible Tamiya ones, preferably from their M4 early which looks okay (and is robust enough to cope with) the Italeri tracks.
Glue the 'working' suspension so it's level. The see-saw action is wrong for a Sherman suspension anyway, the wheels should move independently. Martinnnn ended up doing this with his.
Replace the air filters at the back of the tank. Tamiya's M4A3 105mm has spare ones.
Replace the tools they're awful.
New gun barrel too, Italeri's is based on a tank which may have had the gun disabled before disposal and then repaired.
New antenna base, the Italeri one is for the British 19 set, which is accurate for the post-war Italian Sherman Italeri looked at, but not for a US tank.
Replace or just leave off the turret .50 cal.
Add a bit of texture to the cast hull and turret, but not too much, it deosn't have to look like a ploughed field.
And you can see how well Martinnnn's has turned out