Just no, there are more video games released every year than movies released to theaters, even if we include things that are released straight to DVD, throwing indie games into the mix, blows the number of movie releases out of the water.
As for the rest, it seems like your only experience with movie reviews was Siskel and Ebert, which is a really flawed example, for a number of reasons.
First of all, there's a reason why Siskel and Ebert were considered the best in the industry, their debates were often reasoned and intelligent when they disagreed with each other, although they often agreed with each other too. The rest of the movie review industry also has problems with reviewing in lockstep, and in the last five years, the movie review industry has been hit with many of the same criticisms the game review industry is accused of.
Secondly, Seriously? Siskel has been dead since 1999, and Ebert died last year, you're comparing the entire games review industry to two of the most famous critics in entertainment history, there haven't been critics as prolific as Siskel and Ebert in any review industry, not just games.
Following that up, movie reviews do pretty much the exact same thing, the only difference is that instead of giving lockstep reviews to action schlock like the movie equivalent to Call of Duty, the movie review industry eats up the Oscar bait movies, almost without fail, you will see perfect or near perfect reviews with the biggest sites surrounding these movies.
There are differences in the industries, though, the games review industry is consolidated more amongst a smaller number of big name review sites, whereas movie reviewers tend to be more separate and don't consolidate on a few well known websites. Almost every local paper has a movie reviewer that writes for them, while most people can't name many movie reviewers beyond Siskel and Ebert (who are both dead at this point), many gamers can't name individual reviewers either, but they can generally name the big sites those reviewers appear on. This probably exacerbates the problem you are perceiving, although both industries do it, the consolidated voice of the games review industry makes it seem more monolithic and single-minded.