Season 2 is without doubt the best Voyager season and the best season of all Star Trek series.
Hmm. I don't think I could call any of VOY's seasons the best of all Star Trek, though it has great nostalgia value for me as me and my friend watched it religiously back in the day.
I find the first three seasons of VOY very hit and miss. I didn't mind the first one so much as it was still new back then, and it seemed like the producers were at least trying.
Seasons four onwards brought an improvement, making the show just somewhat
hit and miss.