In my opinion, simulated flesh is a bit pointless if someone truly wants to be a vegetarian. There are plenty of "not just a load of lentils" options. The fake bacon (I call it "fakon") is particularly stupid IMO and most quorn based alternatives are bland in the extreme.
I am not a vegetarian, but I can happily go without meat for long periods of time, I'm not an 'addict'. I can see myself going veg at some point. The meat (and dairy) industry seems pretty dubious to me.
I quite like the veg burgers on offer at Wetherspoons pubs and that's what I normally go for on the rare occasions I visit them.