Is there a large gap between Juventus and say Everton?
Juventus is better than Everton by a significant margin. Many think Juve may be the strongest after Barca and Bayern right now. Not sure I agree with that but it's a different plateau than Everton to say the least.
People are thinking you're trolling because there's a lot fans of EPL teams who never watch Serie A and also 100% buy the English media stereotypes of the league which are generally the exact opposite of what you've witnessed.
In the past the league has been much more defensively oriented than other top leagues but that's really been changing (for better or worse) rapidly the past couple of years.
Right now, more of the top Serie A sides are paying more open attacking styles than ever: Napoli, Roma, Fiorentina, Inter, Milan
I'd actually say that Juventus and Lazio are probably the more "conservative" of the top teams though Juventus with Pirlo simply has some of the most elegant build-up play you'll see.
You'll get a lot of argument about which league is better but, in the end, Serie A, La Liga, EPL, Bundesliga are all pretty close with the differences in strength being more cyclical than anything else.