Hello Cais,
I’m a web developer and have propbably worked on more than 70-80 WordPress websites. I have used NextGEN in many projects and I thank you all for it; however, during my development time, I have come to the conclusion that NextGEN is not an overall reliable plugin to use:
1) I’ve instances where NextGEN hasn’t played nicely with other popular plugins
2) Have received a complete blank page experience on WP websites installed on certain servers (ex: RackSpace)
3) Not good/enough documentation on the usage of shortcodes.
4) Causing jQuery conflicts
5) Not good/enough documentation on the usage of API (functions on how to retrive galleries and albums in the code vs using the UI).
Some of these might have already been fixed. That review was just my instant reaction to the overall experience I’ve had with NextGEN over the years.
Thanks.