If you're considering the Auris Hybrid you need to drive it to see if you like it. If you don't like it, or even if you're not sure you do like it then don't buy one, you don't want to be spending £12K on something you aren't sure you like. It's a significant expense, you need to be as sure as possilbe you're going to like what you get, and if the styling is a deal-breaker for you then that's it. I quite like the styling but agree it's not special, however that's not a problem for me.
Here's my review, for what it's worth. I love my Auris Excel, I've only had it a couple of months but had a 2009 Prius for 3 years before that - they have the same engine and drive train and feel quite similar to drive. It never missed a beat, was cheap to maintain with Toyota fixed price servicing and it sipped petrol.
Last autumn I drove my Prius from Manchester to Dusseldorf non-stop (apart from 2 hours on the ferry and toilet breaks) for a football match and straight back the next day with three friends - all big lads, as am I. I drove at the motorway speed limit except in Germany where there isn't one and I wanted to see how it ran at a ton (much the same as doing 70). It turned in an average 54 mpg over the journey (calculated from what I actually used, not from the onboard computer) and I was relaxed and comfortable even after hours in the driving seat. I don't use any unusual driving techniques to try to achieve economy, I just drive it. I've not been quite so far in the Auris yet (will be touring the South of France in it with SWMBO later this year) but I took it from Manchester to Bournemouth and back on Saturday, and it was just as comfy and relaxed a drive as the Prius and turned in 51 mpg (the Prius is a bit more economical than the Auris).
The day job for my car is a daily commute into central Manchester - I still get 50 mpg in the rush hour traffic and if you're going to be stuck in traffic then the Auris is a nice place to be while you're stuck in it.
I've had lots of cars, petrol and diesel, manual and automatic, and the Prius and Auris Hybrid are the best cars I've had - for what I wanted them for. As you say, it's all down to personal taste, the Auris ticks all the right boxes for me. I'd say have a good long test drive in one and see what you think - but if you don't like it, move on!