I don't mind gimmicks if they're not as intrusive to the core engineering of the toy. TR Sixshot is a great example of this because you don't need to remove Revolver to transform him into any of his modes. It's a non-intrusive gimmick that you can happily choose to ignore if you don't like it, but if you do like it then feel free to use it. The option is there. Other toys live or die by their gimmick. Transformers Armada is often associated with this, with Armada Hot "wHy mY Sh0uLD3r5 hUr7?" Shot being the poor poster boy for toys with overly intrusive gimmicks. You compare ARM Hot Shot with say RiD Side Burn that came shortly before it or even the Universe Hot Shot toy that came a few years after -- both toys put the Armada figure to shame. And this is because much of Hot Shot's upper body is slave to the Mini-Con activated gimmick, sacrificing articulation in the head, shoulders etc. - basically making a relatively blocky and ungainly toy. Although Armada Scavenger is far worse, but overall a lot of the Armada Autobots and Decepticons were compromised by their gimmicks. Extra disappointing given that Hasbro gave themselves
double the amount of time to develop that line compared to most other TF lines.

There was a lot of initial excitement when Armada debuted because we had nearly 2 years of very few new moulds. Lots of redecoes and G1 reissues, but fans were itching for something
new. But the novelty soon wore off and people began realising what a let down Armada was (hence all the jAaM! jokes - Hasbro even acknowledged this as Universe Hot Shot's number plate says "JAAM"

).