No, definitely not. While TOS gave us several memorable aliens and alien types, the other series went well beyond in both areas.
STNG gets criticized for sometimes for bumbpy headed aliens but the fact is, TOS simply would have had regular actors with no makeup or some color thrown on, while STNG used appliances to create humanoid aliens that people could identify with. But STNG upped the ante..we quickly saw non-corporeal aliens in the first few episodes, then the most elaborate lizard-like and canine-like aliens. Crystalline species as part of a worldwide, inorganic computer, a binary-cyborg species, and an insect-like species that were hyper-intelligent parasites. All in the first season. Later on we saw 2-dimesional species, quantum-singularity species, hive-mind cyborgs, colony creatures, living starships, space dwelling species, et al.
As Trek grew on TV both DS9 and Voyager added more elaborate makeups though many were background aliens, something TOS couldn't have dreamed of doing on it's budget. in the first few episodes we saw wormhole aliens, a rather elaborate alien lizard species, and being that fed off of emotions and fear. But for the overall champ, I'd say Voyager showed the most aliens of any ST series, and the most that LOOKED alien. Some memorable ones include: The Hirogen, Species 8472, The Borg (utilizing movie makeup), and many others.
Enterprise had to have the best quality make ups as it was the first shot in HD. You can still look at Andorians on 55+ inch screens and in HD/4K uprez and they still look fantastic. The primitive Andorian makeups from TOS were improved and the antennae move. We also saw some other memorable aliens from TOS in CGI..Tholians, Gorn. These joined the excellent makeups and CGI species from the Xindi arc..
In terms of TOS movies, well, there were lots of aliens in STTMP, but the makeups were mostly not "hero" makeups for close-ups. The Klingons gained a much better makeup that became the pattern for all following Klingons. V-Ger is perhaps the ultimate alien sentient AI species evolving into a human/machine hybrid. There are precious few other aliens of note in the rest of the TOS movie series. The STNG films didn't fare much better.
The JJ movies had lots of elaborate background aliens. There were more non-sentient creatures around. In general they were better integrated on the bridge. We saw a whole village of humanoid aliens that were a step above the previous movie series.
Taken as a whole, no franchise has more or more varied aliens.