Foo fighters-Love their music, but in the last 2-3 albums have all sounded very similar though, not a bad thing in this case.
ACDC- Again like the Foo's, they sounded pretty much the same, except they relied heavily on the old fomula of a catchy riff & solid lead work, good thing imo.
The Ramones- unlike the above, they sounded like the same, but sounded terrible, so if you don't like one pretty much hate them all, well in my case anyway.
Aerosmith-1990 onwars have sounded all the same, the same can also be said about Bon Jovi now, both aren't too bad though.
Van Halen ( post David Lee Roth)- lost some spark after his departure and their style noticably different, they too relied on the old fomula of catchy riffs, solid lead and a good chorous, in VH's case it works a treat and hence the reason why they hav esold so many albums and have influenced so many bands.
Ben Lee- N/A