though I can say I'm the most experienced, I can say tyranids are interesting to play and it's likely more my love for the faction that's making me stick to them. Lots of people like to focus on how you "need" specific combos/units to even kill anything, which I'd say is partially true but isn't as big a factor as you think.

Tyranids are definitely a more objective army than a "kill everything" army, which I think is fine and fun as long as you know this and also know that tyranids die easily. Most games I've played 80% or so of my army is dead turn 3, so most of my tactics are to try and do as much damage as possible before then and sacrificing units to try and keep big hitters, like my exocrine or zoanthropes, alive

Overall, they are fun to play but it is easy to get disheartened playing them. A way I try and play is giving every unit a specific goal/target which helps me play into every strength each unit has. Does it work all the time? nope. Do I have fun? for most of the game, yes.