I haven't leveled a sentinel in quite a while, but I love the way combat plays as far as overall usefulness is concerned. It's been my one and only main for over a year. However, the AC as a whole is not in a good place, which caused me to level a guardian during this 12x period. That's the safe bet now, but sentinels will be viable again (I hope!) so roll one of each and experience both ACs. Play whatever feels fun, it's a game! 😀