Ok yeah in terms of graphics of course. But I have played Crysis 2 and I don't like the way it plays; if you know what I mean.
Though that's the gameplay not the engine, if developers wanted they could get the same "feel" in the Source Engine and vice versa.
The Source Engine was fair when it was released but quickly fell behind. It had dynamic terrain which was uncommon but not as good as in Geo-Mod from 2001. Its mod friendly and its built in lip syncing (facial animation) was a nice touch and still a plus. Other than its got nothing to be impressed by, certainly not today. These days you can even get third party facial animation/lip-syncing for engines and for modding I can't think of any as good as Gamebryo and the Creation Engine. No point in going into what it lacks because that would be a long list even without doing research.
So basically the Source Engine hasn't really had anything going for it for ages, though personally I think more should take its approach to facial animation. Someone might say it has low hardware requirements as a plus but it would take a large paragraph elaborating on why that bounces between useless and untrue due to things like current low end hardware and the higher efficiency of modern engines.
That said they did a really great job making Half Life 2 look good with what they had. They've never been the kind that advances graphics or engine technology. There is something to indicate that Source 2 is in development which would be a good thing since its long overdue. Something on that here
http://www.valvetime.net/threads/exclusive-next-gen-source-2-engine-is-in-development.215336/