A 25 to 28 jump isn't bad. Shimano 12-27 cassettes have a 24 to 27 jump. Campy 12-26 cassettes have a 23 to 26 jump. All those jumps are comparable, with the 25 to 28 jump being (marginally) the smallest. Looked at another way, a 25 to 28 jump is smaller as a percentage than a 15 to 17 jump.

What would annoy me more are the 11 to 13 and 13 to 15 jumps. Personally, I'd rather just a standard 12-27 cassette. But to each his own.