Ouch that is harsh.
I would agree that the Caterhams and a true Lotus 7 would seem to hold their value better only due to their history.
I also think that if one looks at the other manufactures Birkin, Westfield, Ultra's, etc. that are out their one will find they all have their strong points as they all have their weakness.
I personally have driven the following; Caterham's, Westfield's, a Birkin S3, a real Lotus 7 S2, Locost 7 and my own homebuilt replica 7 and if I had the money to purchase another 7 I would most likely get a Caterham SV, as I find it to be a bit more refined over what I have at the moment due to it having all of the weather gear and an interior of sorts and the manufactures history and quality of parts although the Birkin S3 would be nice also along with the Westfield.
Don't get me wrong I am very happy with my car and would have a hard time parting with it if I had too and have not considered it at all even when it has broken down on me.