I met a few Atos characters at the 'recruitment fair' last year. A few things struck me:
1. They were the only firm (as far as I could tell) that was giving out 'business cards' which contained only the address of their careers website. No personal cards here, mate. So for all you guys who went out of your way to travel to the event because you thought it would somehow be beneficial - all they did was tell you to look at their website and apply online. Great.
2. They had a distinctive 'big 4' feel to them. Sort of like they have roots in accountancy and bean counting but now see theirselves as 'consultants'. A big, faceless, unaccountable firm was the impression I came away with.
3. I'm confused by their whole branding thing. What professional consultancy would have a brightly coloured fish as its logo? And what does Atos mean anyway, it sounds like a civil engineering firm. Also are they an expensive IT company or do they really do 'consulting' work? It all sounds a bit 'fishy' to me.
4. The people on the stand weren't exactly friendly. Sure they would talk to you, but the guy I was speaking to (fairly senior) would turn his back as soon as someone else came along. That said a lot to me.
Obviously these are just my own personal opinions. You'll need to form your own conclusions.