You can't exactly expect to see such things in a movie, especialy a movie for all ages.(besides even the prequels lacked the CGI to make it look good) That's why the novels are the best sources of 'realism' because you can use your brain and imagination with little plot 'shields'.
And the video i posted also has good cannon proof of blaster capabilities.The only reason why Stormtroopers are not charred meat or slag is because of the advanced armour.
Blasters can desintegrate even some more advanced alloys and materials,blast large holes in concrete and stone and completely desintegrate an unarmoured or primitively armoured enemy (such as IG troops).
It took 36 shots for a Tau pulse rifle to penetrate the front armour of a Chimera and kill the driver in the Taros Campaign.It would take about 10 with a Blaster given the Imperium does not posses advanced materials or conductive and dispersive ones.
If we are to compare a Storm Trooper (IG) to a Storm Trooper (SW) it is instantly easy to spot that the Grunts of SW have better equipment than the Elites of the Imperial guard.
SW ships have around 3 000Gs acceleration while the fastest IoM ship has 7Gs at best.As per the Siege of Vraks it took weeks for a convoy to reach Vraks Prime.If the ships weren't denfeding the transports it would take still them at least hours (and this would be if so if they were straining the reactors and engines to the limit) as the Comander of the fleet was waithing for the attacking Chaos ships to get in range for a few hours.
These are ratings of the kinetic power which is easiest to absorb by shields.Look at Tau weapons.They work pretty much the same as SW ones only the Charged Particle weapons do more more damage on an atomic level for obvious reasons.(Physics if you didn't get it)
Void shields do not stop missiles,torpedoes or craft such as bombers from passing through while if anything tried this on a Deflector shield it would instantly desintegrate.
And they fail at stopping more powerfull energy weapons.
Even if the shield is not breached, internal damage like fires and exploions still happen.
SW ships posses advanced targeting and jamming technology which renders the missiles and craft of the Imperium to target practise for the on-board computers and crewmen.While at the same time SW craft are faster,smaller and even shielded in most cases and can still pack a very nasty punch.
Gravity bombs or warheads will make your ship fall in on its' self, Anti-matter bombs would render large chunks of your ship gone in seconds (a single bomb is powerfull enough to level a large city).
Thermal Detonator bombs will do large damage in bombing runs.
Proton bombs would be devastating and let's not talk about the capital ship Torpedoes and Missiles.
Come to think of it a few Proton Torpedoes down the muzzle of a Macrocannon would do some serious internal damage.And taking out the Engines is sure to overload a few Plasma reactors while rendering the craft crippled and not able to maneuver to fire it's broadsides at the enemy ships.
The Reactor of a Star Destroyer is described as aminiature sun.And unlike the Plasma reactors of the Imperium's craft they are not highly unstable and can sustain massive energy drain and damage.
Honestly if i was to compare an Imperial Star Destroyer II to an Imperial craft from 40K i would put it at the capabilities of a Cruiser, not an Escort of the same or slightly larger size.
Jedi and Sith have powers that make many (not all) Psykers look like Younglings or Padawans.Illusions on a galactic scale,powers to make mutants and zombies and even techno-zombies,buffing and draining abilities,invisibility to both the naked eye and other Force users,pregocnition,enhanced physical and metal capabilities,telekinesis,mind reading,ability to see the future and/or past,climate control etc.
There are literally about 100 or even more Force powers.
Plus everyone being able to handle themselves in head on combat.
The Death Star would take out Terra form the other side of the Solar System.Besides the DS is mainly a terror weapon.
There are many more effective Superweapons like the Sun Crusher for example.
Or the standard Orbital Bombardment because the IoM does not posses Planetary Shields.Not even on Terra.
Tau Pulse rifles fire plasma pulses via an induction field.
Blasters have 2 main components:Gas chamber filled with an Energy-rich gas (Tiabana gas most of the time) and a power cell.
A said ammount of gas is forced through a conversion enabler,where energy from the power cell excites the gas.The gas,now volatile,then passes through an actuating module,where it is converted into a particle beam,focused through a prismatic crystal or some other device, and emerges from the barrel's emmiter nozzle as a thin bolt of glowing energy.
Blaster bolts themselves carry no heat.But their displacement of matter produces kinetic energy that causes heat.The atmosphere is superheated by bolts' passage;materials struck by a bolt deform and fuse; and liquids inside physical bodies instantly change state into steam,expanding and doing terrible damage to surounding tissiue.