Before saying anything I would like to point out - there is no "shoulds" in investments, its only your or other people's perception of upcoming future.
Anyway, do believe 2017 was the Golden Year of Crypto, in terms of great start of a great new technology in our lives.
Thus, I don't think it was the best year for crypto overall - there were not many good projects and overall technical side was fairly raw compared to current state of crypto market.
Even though bitcoin and eth and most of other old coins are lower in terms of price at the moment - you can clearly see huge improvements in features that cryptos are offering nowadays.
Greater things are yet to come.