I never played the XI summoner, so I "sadly" cannot compare, but no 2 Final Fantasy games have ever had the summons the same, either in execution, style, or abilities. Most people seem to forget that things that work in a single player game usually don't work in a multiplayer game, like an MMO. Summoner in this game is fine, could a few things be improved yes, but is it a broken job, no. And is it a Summoner, YES!!!, it summons things, so please... SHUT UP.
Also, as an outsider who has never played XI, I have to say I only see two groups of people.
One group acknowledges that Summoner is not a broken job and has similar flaws to the other jobs, that a job such as this doesn't work as well in an MMO where other people are involved, if certain designs or mechanics are implimented: long summon sequence, big hulking monster, etc. They realize that there is no such thing as a "traditional" Summoner, since summons change from game to game.
The other group are the winers, who think XI's Summoner was the end all beat all, that no other MMO Summoner can top it. That XIV broke the Summoner job. Well I have a question for those who "love" that Summoner? What was your subjob? What were you doing when you weren't managing your pet? How many times did your big pet block your or someone elses view? Were the answers anything like: any Mage, since Summoner's benefit from the MP/magic boost, were you healing like a WHM or attacking like a BLM or standing around looking at your big summon, and wasn't that summon in you way once or twice? Think about it in every other Final Fantasy game any character who was a Summoner or you placed summons on, had other abilities, right? They had other skills to provide other uses, when SUMMONS WEREN'T NEEDED. You didn't have Yuna summon an Aeon everytime it was her turn, or Dagger and Eiko; and I'm sure most people use Rydia's BLM more than her summons since the spells were cheaper. And don't pretend anyone has ever used summons every time it was the summoners turn. We've all played RPGS, we all try to conserve our resources like MP when we can and use the bare minimum at times. Summons were/are just glorified trash killers. Why waste the MP on a summon that deals X amount of damage for YY MP when another spell does the same amount of damage for Y.
Okay closing my rant. People who like the XI Summoner, that is okay. I like XIV's Scholar, would I like it if I played XI, I dunno, will I like XI's if I ever get to play it, still dunno. But are they not a Scholar, yes, they are, just a different version. So please think about the series as a whole. There is no "traditional" Summoner, just different iterations, but please don't make it that SE broke the job, they didn't.
And also, technically Scholar is a Summoner in this game too, they just got the healing summons, should we bitch about them next?