The single most important thing is don't consolidate into a private loan if you care about federal protections - that's a one-way door you can't undo. A federal Direct Consolidation keeps you in the federal system with income-driven repayment options, public service loan forgiveness eligibility, and deferment/forbearance if you hit hard times. The tradeoff is your new interest rate becomes a weighted average of your current rates, rounded up to the nearest one-eighth of a percent. So consolidating your 4.5%-6% loans would probably give you something in the 5-5.5% range, not a lower rate.
Where consolidation actually helps is simplicity and cash flow. One payment instead of three is easier to manage, and your monthly amount might drop if you extend the repayment term. That said, extending the loan just means more interest paid overall. If your current rates are already reasonable and you can handle three payments, staying separate keeps your options open - you could pay off the highest-rate one faster if you got a bonus or extra money, and you're not locked into a new timeline.
Run the numbers on the federal consolidation site (studentaid.gov has calculators) to see what your actual new rate and payment would be. Compare it to what you're paying now. If the payment drop matters for your budget and you don't mind a slightly higher blended rate, go federal consolidation. If your rates are already good and you're managing fine, there's no shame in leaving them separate.