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You should compliment another player for getting good cards. Complimenting them for playing well is always wrong.

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It is said that complimenting players at the table will subconsciously make other players play to impress you "get your praises". If you praise good play, then the other players will atempt to play better because they have been led to believe that this is what you want. If you praise big hands like 7's full of 3's (with 73o, of course), then players will subconsciously try to make big hands, by drawing to boats when holding 2 pair on a flushed board, or going for gutshots more frequently, and drawing to sets after the flop. This may only work on the mentally inferior, but it gets to a lot of people, and every little bit counts.