Your Jaws example is my point. What they did with it is objectively effective.
Only if you like what the result was(which I happen to as it's my favorite movie of all time). None of these things are standing on their own saying 'Hey, look at me! Aren't I an objectively good component of this greater whole called a movie?'. It doesn't work that way. How you feel about the whole will color how you feel about the individual parts. Now I'm not saying excellence can't stand out amid an over-all bad movie. To use a Scorsese movie as an example: I don't like Gangs of New York. I think it's possibly Scorsese's weakest movie and maybe his only bad movie. There are lots of reasons I think it doesn't work. Yet DDL's performance in it IMO was awesome. Robbed of an Oscar he was, IMO. Like a nugget of gold covered in crap. Now there's an aspect I could separate from the whole but even then I wouldn't say it was an objectively good aspect to the movie.
Also, you seem to miss the point of this entire conversation. Lets use you and your love for MCU as a example. You are predisposed to like MCU films. You expect to like them and thus go in with a mentality to like them. That those films please your sensibilities makes them great films?
I have that expectation of EVERY movie I go to see. If I didn't expect to like them then I wouldn't go see them. This is why on end of the year lists my numbers of actual bad movies is relatively low compared to those I liked at least on some level. I saw 30 movies in 2015 and only 7 of them did I give a bad score to. If I did a top 10 worst movies of 2015 list I'd have to put 3 on there that I actually liked and by definition consider good movies. And I don't rank all MCU films as on the same level. Sure, some are great. Most are just good. And I have yet to see a bad one(and I've seen them all). Of course that kind of brand/franchise consistency is going to breed trust in me, the consumer/audience member. How could it not?
I personally dislike Sandra Bullock as an actress. Not as a person, but an actress. She grates me a bit. But I would never say she is a bad actress. I have seen bad actresses, she isn't one. She just isn't for me.
I wouldn't argue either way if someone said she was a bad actress or a good actress. To me she's an actress who can be either way. It just depends.
There are inherent truths that come with film. We know when we are seeing a good actress like Cate Blanchett or when a film looks cheap. Quality direction is easily identifiable.
Those two are not the same thing. Quality direction is sometimes identifiable, I'd say. Sometimes clearer than others. Blanchett has a string of successful quality performances under her belt so she is a brand that one is apt to trust(I know I do). But saying she's a good actress objectively(and for the sake of the argument I'll not contest this assertion) is not the same thing as saying her performance is good in this or that particular role. THAT is not objective even thought it is just a part of a movie and not the whole.
Now we can more easily tell when a budget is low and thus a movie doesn't look as expensively polished as some other high budget film. But even then that could be by design. Some people like a cheaper look to their films. It's still subjective. The value placed upon these things is still subjective even though we can objectively see that this cost more than that.
Using your method of judging films, isn't it all just a personal issue? So why point it out with Drizzle?
Because his comment seemed so bizarrely personal, it prompted my comment. He didn't just say 'I didn't like his performance in that movie'. I wouldn't have bothered commenting on that at all. But he was very specific that it was Clooney's smugness that turned him off. I as someone who also watched that movie saw no smugness in his performance. I saw confidence, affability, joviality and self-sacrifice. Perhaps a tad bit of immaturity in regards to his humor but that's it. I did not see some smug jerk on screen so I concluded that it must be something expressly unique as to why Drizzle didn't like that performance. I just worded it a lot more concisely.