Almost all current cryptos have very long confirmation times (block generation) which really make them almost useless in a real world (over the counter) transaction. Imagine going to a 7/11 and buying a drink and then asking the staff to wait for 10 minutes confirmation (or 2.5 min in the case of LTC) 
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.But this objection has been answered a long time ago, for Bitcoin. With an active network, there is no need to wait 10 minutes or an hour for a small purchase. This is a problem that does not exist.
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Just shortening the block generation time is really no solution as it just leads to a much larger blockchain.
Also, the lower difficulty means you need more blocks to get an equivalent level of confirmation, so I'm not convinced it really buys you anything. i.e., if a blockchain targets 5 minute blocks on average and is identical to Bitcoin in all other respects, I believe you would need 12 blocks to reach an equivalent level of confirmation as 6 blocks on the Bitcoin blockchain.