Disagreement on strategy is expected. Here's an example of how to do it politely:
Original text:
A good way to keep tyrants at bay is to fire a continuous stream of lucifer cannon shots down a corridor.
Good disagreement:
A good way to keep tyrants at bay is to fire a continuous stream of lucifer cannon shots down a corridor. (NOTE - while such “luci-spamming” may be effective, it's considered a noob-level tactic, and many servers ban it)
Bad disagreement:
A good way to keep tyrants at bay is to fire a continuous stream of lucifer cannon shots down a corridor. LUCI SPAM!!!!! YOU UR TEH NOOB!!!!
Bad disagreement:
A good way to keep tyrants at bay is to fire a continuous stream of lucifer cannon shots down a corridor. (deleted)