Goseiger vs. Shinkenger is one of the recent team-ups of late that hit nearly everything I want from these specials.
I know continuity isn't that important or emphasized in the East compared to the West, but I really like how this team up felt like it continued from the finale within a reasonable time-frame. It's something that I felt was done right in specials like Gekiranger vs. Boukenger and Dekaranger vs. Abaranger, but not in specials like Magiranger vs. Dekaranger (Fire Squad, for example), and Go-onger vs. Gekiranger (how they all got together despite Jan and Gou venturing off could've been done better, personally). It made sense for all of them to come back the way they did, and I think the special is all the better for it.
Seeing Takeru treat Alata like an ally at the beginning was something I enjoyed. It showed just how far Takeru has come in terms of personality, and it was a welcome change to see the Reds getting along. It actually made the hostility that Ryunosuke and Chiaki held towards the Goseigers surprising, since it's usually the non-Reds that generally get along with each other.
I liked how long they kept Bladerun's identity hidden from the audience (or those that weren't keeping a close eye on the movie's news). I wish it would've been something referenced in the series proper, but alas.
The debut of the Gokaigers was cool, if really, really contradictory to the actual Gokaiger story. The suit actors and writers did a great job of keeping their personalities and movements (specifically, how GokaiPink and Green like using their guns, while Yellow and Blue used their swords to the point where Blue double-wielded!) very similar to how they behave on the show, which is something I think was last done effectively in W's debut.
I wish we would've been able to see Kaoru in action again. If the Goseigers made Super Change cards for the Shinkengers, surely Kaoru deserved a way to fight alongside the other Shinkengers? I do understand why Kaoru wouldn't fight alongside Takeru story-wise; I'll admit it's my desire to see both ShinkenReds fighting together.
I had one minor disappointment before this was subbed and I only had the OST to "tell" me the story, so to speak: the ED theme was initially disappointing compared to last year's until I realized through the lyrics that it's a song referencing Super Sentai more than Shinkenger. In a way, the song (and essentially, the film itself) is the first form of media to reference the 35th Anniversary.
All in all, it was a very enjoyable teamup, and my favorite Vs. since Dekaranger vs. Abaranger.