As someone who really enjoys meat but tries to eat vegetarian (and does so 99% of the time), I can't say that I've ever been impressed by the taste of a non-meat sausage. Every single one I've had has left me wishing I'd just had falafel instead. Fortunately falafel is delicious and cheap

Notably, though, vegetarian haggis - which is essentially just a large sausage - is usually pretty damn good. I have no idea why it seems to end up differently. Maybe because haggis depends less on the meat flavour in the first place?